October 18, 2023 at 4:03 pm
October 18, 2023 at 9:19 pmFederico Alzamora PrevitaliAnsys Employee
I'm not sure I understand physically what you're trying to do. If your model is axissymmetric, then there cannot be a wall.
October 19, 2023 at 4:02 pmZoelle WongSubscriber
essentially, I'm trying to model a hot rod inside the nozzle, but with an axis BC applied at the line of symmetry
I agree, you can't have a wall at the axis since that's physically impossible. But I need a heat column (via a wall or source) revolved around my axis. Does this make more sense?
October 19, 2023 at 7:08 pmFederico Alzamora PrevitaliAnsys Employee
Right, I understand better now. In that case, you might have to provide a thickness for your rod, make it a source, and identify the outer edge as your axis. You cannot assign any boundary conditions, thermal or other, to an axis.
October 19, 2023 at 7:15 pmZoelle WongSubscriber
Ok; one follow up question- I've specified the "hot" wall region as a "solid" zone, and everywhere else as the "fluid" zone. But I get the following error message:
Warning: materials in neighbor cell threads (2 and 6) of
interior zone 11 are of different types (aluminum and air).
Do you know what this is related to? I'm making my mesh via Pointwise instead of ANSYS' internal meshing tool
October 19, 2023 at 7:49 pmZoelle WongSubscriber
I think I figured it out - but it's not the best solution. What are your thoughts on the following (thank you again so much):
Essentially, I had to go to Pointwise and specify both regions as a fluid. Then under internal BC's, set a fixed temperature value. I did this for a simple "flow in the box"; no slip condition on top wall, inlet velocity BC, pressure outlet BC, axis on the bottom wall and "side" walls. The temperature plot matches what I was expecting, but the velocity contour plot looks incorrect - i'd expect an even gradient near the "hot" fluid region:
*first image is a diagram of the mesh+BC; 2nd /3rd imags are contour plots
October 19, 2023 at 7:54 pmFederico Alzamora PrevitaliAnsys Employee
Does this wall have a wall/shadow pair? This is required for heat transfer between different materials.
If you don't see this in your boundaries zones, try the following command in the TUI console:
then enter the Face ID of that boundary.
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