The mesh faces can be saved and imported into other programs as well. The same mesh can be imported several times to provide different perspectives and solutions to the problem. This is possible because CFD simulations process only the boundary conditions of the fluid flow problem, and do not modify the geometry.
The mesh boundary conditions should be set by using the Boundary Condition panel. In this tutorial, we will use the Force or Pressure option. In both cases, the velocity is assumed to be zero at the boundaries. Click on the Plus sign to add the boundary condition. In the Boundary Condition dialog window, choose the Face Group number to be controlled by the boundary condition, enter the desired value for the force or pressure, and click OK. The CFD mesh size should be set in the Mesh Size item. Each mesh face has a size and they should match each other. In this tutorial, we will use the first value, about 0.2, for the mesh size.
In order to solve the problem, the surface of the valve should be covered with the CFD mesh. In this tutorial, we will solve the problem for the length of the valve determined by the outlet boundary. Note that in this situation, a slice of the mesh will be on the inlet and outlet surfaces. To avoid a current of the mesh, we have to create additional faces which should be marked with dotted lines. Right click over the surface of the valve in 3D view and select Add Border. On the right panel, select Create Surface From Border. In the Boundary Select dialog window, choose A as Base, B as Top, and C as the left, right, front, and back.
The lattice Boltzmann method is a lattice simulation technique for kinetic-based fluid flow simulations. A lattice is a regular array of nodes, each of which is connected to its nearest neighbors. On the nodes are the numerical algorithms for the simulation of the physical systems.
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