Recently, I am doing my graduation thesis design, which involves the fluid-solid composite heat transfer problem of solid heat conduction and fluid convection heat transfer. Looking through books for CFX software is more suitable for this kind of analysis. After the first attempt to draw unstructured grids with ICEM, the calculation results of CFX have not been displayed normally, and the fluid temperature has not changed. Many attempts were fruitless. At first, I thought it was a grid drawing problem, but I couldn't find a solution, so I used the grid of workbench to solve it. In the search for information, I found that such tutorials are rare, so here is a simple process introduction.

Software version, ANSYS_ 19.0

? Solidwork draws solid domain and fluid domain respectively. Because my calculation only involves the fluid-solid coupling of one surface, and all other surfaces adopt the assumption of adiabatic smooth wall, there is no solid side wall. There is no need to use assembly drawing when modeling, but it must be divided into two parts. Igs format is generally selected for model output (solidwork source files should also be saved for future model changes).

On the one hand, because the author is really lazy, on the other hand, I don't know much about the method of grid structured grid drawing. So choose the way of automatic generation. The specific steps are as follows:

Open workbench, select mesh in Component_Systems and place it in the workspace. After importing the geometry into the model, right-click DesignModeler.

In DesignModeler, not much operation is needed. You only need to rename two entity domains and merge them into Form_new_part. For specific operations, you can select two geometry right-click forms _ new _ parts in the operation tree.

Then enter the grid in workbench. The operation here is similar to icem. It is very important to select a face (hold down the Ctrl key to check) and right-click Create Named Selection to create a name. Other surfaces operate similarly. In the interface, I only set the interface on one side of the fluid domain. Finally, when CFX is imported, the corresponding solid domain surface will be automatically selected. (I don't know if it has any influence)

After the setting is completed, the grid drawing is completed. Firstly, the tetrahedral grid algorithm is selected, and the right-click grid of the project tree species selects the insertion and selection method. I choose tetrahedron in the method setting and Patch_conforming in the algorithm. There is a book that repairing tetrahedron and scanning method can be mixed to generate multi-body parts of * * * grid.

After selecting the grid, there are a series of secondary menus below. The calculated physical properties are set to the default settings, CFD is selected, and the solver is CFX(Fluent, etc. ). Setting grid size parameters in the size menu is consistent with the basic idea set in icem. In size control, the size function can choose five options: adaptive, approximate and curvature, curvature, approximation and uniformity) 5.

Finally, click Update to generate the grid, and you can see the quality distribution of the grid after selecting the quality scale. Hmm ~ There is no negative grid, and the average mass fraction is 0.84. Save it.

Go back to the workbench and enter CFX, and set the corresponding parameters in CFX according to the previously set surface. The specific setting method is not expanded, but you must check the heat transfer in the interface setting and select the interface flux in the options. After setting the solver parameters, the calculation can be made.

After several hours of calculation, the calculation is completed.

Open the post-processing software and simply display the results. It can be seen that both fluid and solid have heat changes, indicating that the thermal coupling calculation of fluid and solid has been completed.

Finally, this is just a simple process calculation for your reference, with many shortcomings and omissions. I hope you can give me more advice and guidance.