Solidworks fluid simulation tutorial pdf

With lots of additions and thorough review, we present a book to help professionals as well as learners in creating some of the most complex solid models. The book follows a step by step methodology. In this book, we have tried to give real-world examples with real challenges in designing.

We have tried to reduce the gap between university use of SolidWorks and industrial use of SolidWorks. New practice questions have been added in this edition. The book covers almost all the information required by a learner to master the SolidWorks. In-Depth explanation of concepts Every new topic of this book starts with the explanation of the basic concepts.

In this way, the user becomes capable of relating the things with real world. Topics Covered Every chapter starts with a list of topics being covered in that chapter. Instruction through illustration The instructions to perform any action are provided by maximum number of illustrations so that the user can perform the actions discussed in the book easily and effectively.

There are about illustrations that make the learning process effective. Nevertheless, due to the isotropic permeability, the main gas stream expands in the isotropic catalyst and occupies a larger volume in the next part of the body than in the unidirectional catalyst, which, due to its unidirectional permeability, prevents the stream from expanding. So, the flow in the last two-thirds of the first catalyst body is less non-uniform in the isotropic catalyst.

Since the distance between the two porous bodies installed in the tube is rather small, the gas stream has no time to become more uniform in the volume between the catalyst bodies, although in the unidirectional case a certain motion towards uniformity is perceptible. As a result, the flow non-uniformity occurring at the first catalyst body's exit passes to the second catalyst body. Then, it is seen that the flow non-uniformity does not change within the second catalyst body. Let us now consider the flow velocity inside the catalyst.

This is easy to do since the flow trajectories' colors indicate the flow velocity value in accordance with the specified palette. To create the same conditions for comparing the flow velocities in the isotropic and unidirectional catalysts, we have to specify the same velocity range for the palette in both the cases, since the maximum flow velocity governing the value range for the palette by default is somewhat different in these cases.

It is seen that, considering the catalyst on the whole, the flow velocities in the isotropic and unidirectional catalysts are practically the same. Therefore, from the viewpoint of gas residence in the catalyst, there is no difference between the isotropic and unidirectional catalysts. This difference is due to the different flow non-uniformity both in the catalyst bodies and out of them.

Being determined, these losses are summed to form the total hydraulic loss. Generally, there are no problems in engineering practice to determine the friction loss in a piping system since relatively simple formulae based on theoretical and experimental investigations exist. The other matter is the local hydraulic loss or so-called local drag. Here usually only experimental data are available, which are always restricted due to their nature, especially taking into account the wide variety of pipe shapes not only existing, but also advanced and devices, as well as the substantially complicated flow patterns in them.

Flow Simulation presents an alternative approach to the traditional problems associated with determining this kind of local drag, allowing you to predict computationally almost any local drag in a piping system within good accuracy. In the Open dialog box, browse to the Valve. Alternatively, you can drag and drop the Valve. The local hydraulic loss or drag produced by a ball valve installed in a piping system depends on the valve turning angle or on the minimum flow passage area governed by it.

In order to extract the pure local drag the hydraulic friction loss in the straight pipe of the same length must be subtracted from the measured dynamic head loss.

In this example we will obtain pressure loss local drag in the ball valve whose handle is turned by an angle of 40o. The Valve analysis represents a typical Flow Simulation internal analysis. The fluid enters a model at the inlets and exits the model through outlets. To perform an internal analysis all the model openings must be closed with lids, which are needed to specify inlet and outlet flow boundary conditions on them.

In any case, the internal model space filled with a fluid must be fully closed. You simply create lids as additional extrusions covering the openings. In this example the lids are semi-transparent allowing a view into the valve. Then click Check to calculate the fluid and solid volumes of the model. If the fluid volume is equal to zero, the model is not closed. Click Fluid Volume to see the volume that will be occupied by fluid in the analysis.

Uncheck Fluid Volume. Close the Check Geometry dialog box. The first step is to create a new Flow Simulation project. The project wizard guides you through the definition of a new Flow Simulation project. Each Flow Simulation project is associated with a SolidWorks configuration. You can attach the project either to the current SolidWorks configuration or create a new SolidWorks configuration based on the current one.

For this project use the International System SI by default. To disregard closed internal spaces not involved in the internal analysis, you select Exclude cavities without flow conditions. The Reference axis of the global coordinate system X, Y or Z is used for specifying data in a tabular or formula form in a cylindrical coordinate system based on this axis.

This dialog also allows you to specify advanced physical features you may want to take into account heat conduction in solids, gravitational effects, time-dependent problems, surface-to-surface radiation, rotation. Specify Internal type and accept the other default settings. You can also use the Engineering Database to specify a porous medium.

The Engineering Database contains pre-defined unit systems. It also contains fan curves defining volume or mass flow rate versus static pressure difference for selected industrial fans.

You can easily create your own substances, units, fan curves or specify a custom parameter you want to visualize. For this project accept the default Adiabatic wall feature denoting that all the model walls are heat-insulated.

For steady internal problems, the specification of these values closer to the expected flow field will reduce the analysis convergence time. For unsteady transient, or time-dependent problems Flow Simulation marches in time for a period you specify. For this project use the default values. For this project accept the default result resolution level 3. However, this information may be insufficient to recognize relatively small gaps and thin model walls.

This may cause inaccurate results. In these cases, the Minimum gap size and Minimum wall thickness have to be specified manually. The higher the Result Resolution, the finer the mesh and the stricter the convergence criteria. Geometry Resolution specified through the minimum gap size and the minimum wall thickness governs proper resolution of geometrical model features by the computational mesh. Naturally, finer Geometry Resolution requires more computer resources.

You also can use the Flow Simulation Analysis tree to modify or delete the various Flow Simulation features. At the same time, a computational domain appears in the SolidWorks graphics area as a wireframe box. The next step is specifying Boundary Conditions. Boundary Conditions are used to specify fluid characteristics at the model inlets and outlets in an internal flow analysis or on model surfaces in an external flow analysis. The selected face appears in the Faces to Apply the Boundary Condition list.

This will simulate water flow entering the valve with the velocity of 1. The Boundary Condition dialog appears with the selected face in the Faces to apply the boundary condition list.

The specification of boundary conditions is incorrect if the total mass flow rate on the inlets is not equal to the total mass flow rate on the outlets. In such case the calculation will not start. Also, note that the mass flow rate value is recalculated from the velocity or volume flow rate value specified on an opening.

To avoid problems with specifying boundary conditions, we recommend that you specify at least one Pressure opening condition since the mass flow rate on a Pressure opening is automatically calculated to satisfy the law of conservation of mass. By specifying this condition we define that at the ball valve pipe exit the water has a static pressure of 1 atm. The easiest and fastest way to find the parameter of interest is to specify the corresponding engineering goal.

Now the Flow Simulation project is ready for the calculation. Flow Simulation will finish the calculation when the steady-state average value of total pressure calculated at the valve inlet and outlet are reached. The Run dialog box appears. Flow Simulation automatically generates a computational mesh by dividing the computational domain into slices, which are further subdivided into cells. The cells are refined if necessary to resolve the model geometry properly.

During the mesh generation process, you can see the current step in the Mesh Generation dialog box. Monitoring the Solver After the calculation starts, the Solver Monitor dialog provides you with the current status of the solution. You can also monitor the goal changes and view preliminary results at selected planes.

In the bottom pane of the Info window Flow Simulation notifies you if inappropriate results may occur. In this case the vortex is broken into incoming and outgoing flow components. When flow both enters and exits an opening, the accuracy of the results is diminished. Moreover, there is no guarantee that convergence i. Anyway, in case a vortex crosses a pressure opening the obtained results become suspect. If this warning persists we should stop the calculation and lengthen the ball valve outlet pipe to provide more space for development of the vortex.

Since the warning persists, click File, Close to terminate the calculation and exit the Solver Monitor. You can easily extend the ball valve inlet and outlet sections by changing offset distance for the Inlet Plane and Outlet Plane features.

Instead, we will simply clone the project to the pre-defined 40 degrees - long valve configuration. Confirm the both warning messages with Yes. The new Flow Simulation project, attached to the 40 degrees - long valve configuration, has the same settings as the old one attached to the 40 degrees - short valve so you can start the calculation immediately.

In the Flow Simulation analysis tree, right-click the root 40 degrees - long valve item and select Run. Then click Run to start the calculation. When the calculation is finished, close the Solver Monitor dialog box. Let us now see the vortex notified by Flow Simulation during the calculation, as well as the total pressure loss.

The Cut Plot dialog box appears. To define the view section, you can use SolidWorks planes or model planar faces with the additional shift if necessary.

The parameter values can be represented as a contour plot, as isolines, as vectors, or in a combination e. Its name appears in the Section Plane or Planar Face list. However, the cut plot cannot be seen through the non-transperent model.

In order to see the plot, you can hide the model by clicking Flow Simulation, Results, Display, Geometry. Alternatively, you can use the standard SolidWorks Section View option. Now you can see a contour plot of the velocity and the velocity vectors projected on the plot. For better visualization of the vortex you can scale small vectors: 9 In the Flow Simulation Analysis tree, right-click the Cut Plot 1 icon and select Edit Definition.

This allows us to visualize the low velocity area in more detail. Immediately the cut plot is updated. You can easily visualize the vortex by displaying the flow relative to the X axis. For that, you can display the x-component of velocity in a two-color palette and set the value, separating two colors, at zero.

Now the distribution of the Velocity X parameter is displayed in red-blue palette so that all the positive values are in red and all the negative values are in blue. This means that the blue area show the region of reverse flow, i. Next, we will display the distribution of total pressure within the valve. To enable or disable a certain physical parameter for displaying, use Customize Parameter List.

In the opened dialog box, change the visualization parameter to Total Pressure. This will update the current cut plot to display the total pressure contour plot. While the cut plot shows you the flow pattern, we will use the surface goal plot to determine the inlet and outlet values of total pressure required to calculate the loss. Flow Simulation uses Excel to display goal plot data. Each goal plot is displayed in a separate sheet. The converged values of all project goals are displayed in the Summary sheet of an automatically created Excel workbook.

Click View, Display, Section View to hide the section. The Goal Plot dialog box appears. The Goals1 Excel workbook is created. This workbook displays how the goal changed during the calculation.

You can take the total pressure value presented at the Summary sheet. However, to demonstrate the wide capabilities of Flow Simulation, we will calculate the pressure loss with the Flow Simulation gasdynamic Calculator. The calculator is a very useful tool for rough estimations of the expected results, as well as for calculations of important characteristic and reference values.

All calculations in the Calculator are performed only in the International system of units SI, so no parameter units should be entered, and Flow Simulation Units settings do not apply in the Calculator.

The New Formula dialog box appears. The total pressure loss formula appears in the Calculator sheet. In the Result or A column you see the formula name, in the next columns B, C, etc. The result value appears in the Result column cell immediately when you enter all the arguments and click another cell. Click any free cell. Immediately the Total pressure loss value appears in the Result column. To obtain the pure local drag, it is necessary to subtract from the obtained value the total pressure loss due to friction in a straight pipe of the same length and diameter.

To do that, we perform the same calculations in the ball valve model with the handle in the 0o angle position. You can do this with the 00 degrees - long valve configuration.

Since the specified conditions are the same for both 40 degrees - long valve and 00 degrees - long valve configuration, it is useful to attach the existing Flow Simulation project to the 00 degrees - long valveconfiguration. Note that using a smaller gap size will result in a finer mesh and, in turn, more computer time and memory will be required for calculation. To solve your task in the most effective way you should choose the optimal settings for the task.

Changing the Geometry Resolution Check to see that the 00 degrees - long valve is the active configuration. Click Flow Simulation, Solve, Run. After the calculation is finished, create the Goal Plot. The goals2 workbook is created. Go to Excel, then select the both cells in the Value column and copy them into the Clipboard. Browse to the folder where you saved the calculator file earlier in this tutorial and select the ball valve. Click Open. The cursor appears. The value of total pressure is now taken from the B4 cell.

The value of total pressure is now taken from the B5 cell. Immediately the total pressure value is recalculated. In this example we use Flow Simulation to determine the drag coefficient of a circular cylinder immersed in a uniform fluid stream. The cylinder axis is oriented perpendicular to the stream. The goal of the simulation is to obtain the drag coefficient predicted by Flow Simulation and to compare it to the experimental data presented in Ref.

Opening the Model Click File, Open. In the Open dialog box, browse to the Cylinder 0. Alternatively, you can drag and drop the cylinder 0. For external flow analyses the far-field boundaries are the Computational Domain boundaries. You can also solve a combined external and internal flow problem in a Flow Simulation project for example flow around and through a building. If the analysis includes a combination of internal and external flows, you must specify External type for the analysis. In this project we will analyze flow over the cylinder at the Reynolds number of 1.

In the Configuration name box, type Re 1. This is the name of the SolidWorks configuration that will be created for the associated Flow Simulation project. In this project we will specify the International System SI by default. This dialog also allows you to specify advanced physical features you want to include in the analysis. The Reference axis of the global coordinate system X, Y or Z is used for specifying data in a tabular or formula form with respect to a cylindrical coordinate system based on this axis.

In this project we keep the default Adiabatic wall setting, denoting that all the model walls are heat-insulated and accept the default zero wall roughness.

Thus you will specify initial conditions inside the Computational Domain and boundary conditions at the Computational Domain boundaries. The ambient conditions are thermodynamic static pressure and temperature by default , velocity, and turbulence parameters.

In this project we consider the flow under the default thermodynamic conditions i. For convenience we can use the Dependency box to specify the incoming flow velocity in terms of the Reynolds number. The Dependency button is enabled. The Dependency dialog box appears. Here: 1 — Reynolds number Re 0. You will return to the Initial and Ambient Conditions dialog box.

For most flows it is difficult to have a good estimation of their turbulence a priori, so it is recommended that the default turbulence parameters be used. The default turbulence intensity values proposed by Flow Simulation are 0. In this project we accept the default value of 0. The project is created and the 3D Computational Domain is automatically generated.

In this tutorial we are interested in determining only the drag coefficient of the cylinder, without accounting 3D effects. Thus, to reduce the required CPU time and computer memory, we will perform a two-dimensional 2D analysis in this tutorial. You can see that the Z min and Z max boundaries are set automatically, basing on the model dimensions. However, in this case we will compare the Flow Simulation results to experimental results and we would like to determine the drag coefficient with a high degree of accuracy.

In order to eliminate any disturbances of the incoming flow at the Computational Domain boundaries due to the presence of the cylinder, we will manually set the boundaries farther away from the cylinder. The accuracy will be increased at the expense of required CPU time and memory due to the larger size of Computational Domain. Since the incoming flow is aligned with the X-axis direction, the cylinder drag coefficient is calculated through the X-component of the force acting on the cylinder.

The X-component of force can be determined easily by specifying the appropriate Flow Simulation goal. In this case you will need to specify the Force X as a Global Goal. This ensures that the calculation will not be finished until Force X is fully converged in the entire computational domain i. In this example the default Global Coordinate System meets the task. Specifying an Equation Goal When the calculation is finished, you can manually calculate the drag coefficient from the obtained force value.

Instead, let Flow Simulation make all the necessary calculations for you by specifying an Equation Goal. To compare the Flow Simulation results with the experimental curve taken from Ref. The Cylinder 1m. The new Re configuration is created with the Flow Simulation project attached. Since the new project is a copy of the Re 1 Flow Simulation project, you only need to change the flow velocity value in accordance with the Reynolds number of Use the General Settings dialog box to change the data specified in the Wizard, except the settings for Units and Result and Geometry Resolution.

You can change General Settings to correct the settings made in the Wizard or to modify the project created with the Flow Simulation Template in accordance with the new project requirements. The General Settings dialog box appears. Since our simulation is performed with water only, let us increase the cylinder diameter to 1 m to perform the calculation at a Reynolds number of Cloning a project is convenient if you want to create similar projects for the same model. The easiest way to apply the same general project settings to another model is to use the Flow Simulation Template.

These settings are: problem type, physical features, fluids, solids, initial and ambient flow parameters, wall heat condition, geometry and result resolution, and unit settings. Notice that Boundary Conditions, Fans , Initial Conditions, Goals and other features accessible from the Flow Simulation, Insert menu, as well as results are not stored in the template. Initially, only the New Project default template is available, but you can easily create your own templates.

The Create Template dialog box appears. The new Flow Simulation template is created. Next, create a new project based on the Cylinder Drag template. Creating a Project from the Template Open the Cylinder 1m. The New Flow Simulation Project dialog box appears. The newly created project has the same settings as the Re project with the cylinder 0. The only exceptions are Geometry Resolution and Computational Domain size, which are calculated by Flow Simulation in accordance with the new model geometry.

Notice that the 2D simulation setting and Global Goal are retained. Next, you can modify the project in accordance with the new model geometry. Click OK to return to the General Settings dialog box. By default, Flow Simulation determines the default turbulence length basis equal to one percent of the model overall dimension i. For the cylinder 1m we need to change this value. Type 0.

Rename the Equation Goal 1 to Drag Coefficient. Now you can solve all of the projects created for both cylinders. Solving a Set of Projects Flow Simulation allows you to automatically solve a set of projects that exist in any currently opened document. Also select the Close Monitor check box in the All projects row. When the Close Monitor check box is selected, Flow Simulation automatically closes the Solver Monitor window when the calculation finishes.

Switch to Excel to obtain the value. Create the goal plot for both the goals. We will use the averaged goal value for the other two cases as well. In this example we use Flow Simulation to determine the efficiency of a counterflow heat exchanger and to observe the temperature and flow patterns inside of it.

With Flow Simulation the determination of heat exchanger efficiency is straightforward and by investigating the flow and temperature patterns, the design engineer can gain insight into the physical processes involved thus giving guidance for improvements to the design.

The efficiency can be determined if the temperatures at all flow openings are known. In Flow Simulation the temperatures at the fluid inlets are specified and the temperatures at the outlets can be easily determined. The maximum possible heat transfer is attained if one of the fluids was to undergo a temperature change equal to the maximum temperature difference present in the exchanger, which is the difference in the inlet temperatures of the hot and cold fluids, respectively: T hot inle t — T i nl et.

The obtained wall temperature value can be further used for structural and fatigue analysis. In the Open dialog box, browse to the Heat Exchanger. Alternatively, you can drag and drop the Heat Exchanger.

In the Configuration name box type Level 3. For this project we will use the International System SI by default. Selecting the Heat conduction in solids option enables the combination of convection and conduction heat transfer, known as conjugate heat transfer.

In this project we will analyze heat transfer between the fluids through the model walls, as well as inside the solids. Check that the Default fluid type is Liquids. In this dialog you specify the default solid material applied to all solid components. To assign a different material to a particular assembly component you need to create a Solid Material condition for this component. If the solid material you wish to specify as the default is not available in the Solids table, you can click New and define a new substance in the Engineering Database.

The tube and its cooler in this project are made of stainless steel. Expand the Alloys folder and click Steel Stainless to make it the default solid material. Leave the default zero wall roughness. Flow Simulation automatically converts the entered value to the selected system of units. Click Next accepting the default values of other parameters for initial conditions. After finishing the Wizard you will complete the project definition by using the Flow Simulation Analysis tree.

First of all you can take advantage of the symmetry of the heat exchanger to reduce the CPU time and memory required for the calculation. This procedure is not required, but is recommended for efficient analyses.

Specifying a Fluid Subdomain Since we have selected Liquids as the Default fluid type and Water as the Default fluid in the Wizard, we need to specify another fluid type and select another fluid air for the fluid region inside the tube through which the hot air flows.

We can do this by creating a Fluid Subdomain. Immediately the fluid subdomain you are going to create is displayed in the graphics area as a body of blue color.

You may check if the region to apply a fluid subdomain is selected properly by looking at the fluid subdomain visualization in the graphics area. Because Air was defined in the Wizard as one of the Project fluids and you have selected the appropriate fluid type, it appears as the fluid assigned to the fluid subdomain.

These settings are applied to the specified fluid subdomain. Flow Simulation will automatically convert the entered values to the selected system of units. These initial conditions are not necessary and the parameters of the hot air inlet flow are defined by the boundary condition, but we specify them to improve calculation convergence.

The new Fluid Subdomain 1 item appears in the Analysis tree. Right-click the Fluid Subdomain 1 item and select Properties. The Boundary Condition dialog box appears. You can double- click the callout to open the quick-edit dialog. Since the symmetry plane halves the opening, we need to specify a half of the actual mass flow rate. The new Inlet Mass Flow 1 item appears in the Analysis tree.

This boundary condition specifies that water enters the steel jacket of the heat exchanger at a mass flow rate of 0. Next, specify the water outlet Environment Pressure condition.

Next we will specify the boundary conditions for the hot air flow. Accept the default Coordinate System and Reference axis. The default temperature value is equal to the value specified as the initial temperature of air in the Fluid Subdomain dialog box. We accept this value. The new Inlet Velocity 1 item appears in the Analysis tree. Next specify the air outlet Environment Pressure condition. Accept the default values of other parameters. This project involving analysis of heat conduction in solids.

Specifying Solid Materials Notice that the auxiliary lids on the openings are solid. Since the material for the lids is the default stainless steel, they will have an influence on the heat transfer. You cannot suppress or disable them in the Component Control dialog box, because boundary conditions must be specified on solid surfaces in contact with the fluid region. However, you can exclude the lids from the heat conduction analysis by specifying the lids as insulators.

As you select the lids, their names appear in the Components to Apply the Solid Material list. Now all auxiliary lids are defined as insulators.

Hence there is no heat transferred through an insulator. Accept the selected Use for Conv. After the calculation finishes you can obtain the temperature of interest by creating the corresponding Goal Plot.

Toolbars and SolidWorks CommandManager are very convenient for displaying results. The Flow Simulation Results toolbar appears. The Flow Simulation Results Features toolbar appears. The Flow Simulation Display toolbar appears. The SolidWorks CommandManager is a dynamically-updated, context-sensitive toolbar, which allows you to save space for the graphics area and access all toolbar buttons from one location.

The tabs below the CommandManager is used to select a specific group of commands and features to make their toolbar buttons available in the CommandManager. If you wish, you may hide the Flow Simulation toolbars to save the space for the graphics area, since all necessary commands are available in the CommandManager. To hide a toolbar, click its name again in the View, Toolbars menu. You can view the average temperature of the tube on the Summary sheet.

In the Parameter box, select Temperature. The cut plot is created but the model overlaps it. Click the Right view on the Standard Views toolbar. This will update the current cut plot in accoradance with the specified temperature range. To see how the water flows inside the exchanger we will display the Flow Trajectories. Click the bottom pane to make it the active pane. Let us now display how the flow develops inside the exchanger. Flow Simulation allows you to display results in all four possible panes of the SolidWorks graphics area.

Moreover, for each pane you can specify different View Settings. The gray contour around the pane border indicates that the view is active. Click the top pane and set the same display mode for it by clicking Hidden Lines Visible again.

The Flow Trajectories dialog appears. This will select the inner face of the Water Inlet Lid to place the trajectories start points on it. Trajectories are created and displayed. Since you specified velocity, the trajectory color corresponds to the velocity value. To define a fixed color for flow trajectories click Color and select a desired color.

Since we are more interested in the temperature distribution, let us color the trajectories with the values of temperature. Immediately the trajectories are updated. To get more information about the temperature distribution in water you can manually specify the range of interest. Let us display temperatures in the range of inlet-outlet water temperature.

The water minimum temperature value is close to K. Let us obtain the values of air and water temperatures at outlets using Surface Parameters. You will need these values to calculate the heat exchanger efficiency and determine the appropriate temperature range for flow trajectories visualization. All parameters are divided into two categories: Local and Integral. For local parameters pressure, temperature, velocity etc. The Surface Parameters dialog appears. This is especially convenient for such parameters as mass and volume flow.

You can see that the average water temperature at the outlet is about K. Now let us determine the temperature of air at the outlet. You can see that the average air temperature at the outlet is about K. You can see that the mass flow rate of air is 0. This value is calculated with the Consider entire model option selected, i. In this example the water mass flow rate is 0. The specific heat of water at the temperature of K is about five times greater than that of air at the temperature of K.

Thus, the air capacity rate is less than the water capacity rate. Therefore, according to Ref. We already know the air temperature at the inlet K and the water temperature at the inlet In such cases we recommend you trying the Flow Simulation options allowing you to manually adjust the computational mesh to the solved problem's features to resolve them better.

This tutorial teaches you how to do this. Open the Ejector in Exhaust Hood. Thus, it is recommended to set all conditions before you start to analyze the mesh. The first two boundary conditions are imposed on the exhaust hood's inlet and outlet.

Inlet Environment Pressure: Boundary Default values Open the Initial Mesh dialog box click Flow Simulation, Initial Mesh and select the Manual specification of the minimum gap size option. You will see that the current automatic minimum gap size is 0. Click Cancel to close this dialog box. Bay deceptions widow relationship app for mysore girls courting sites and girls must follow earlier than you could. Functional area: bfy3wg; linkedin relationship app that demits online dating companion but he had met on the gents may have don t anymore?

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