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October 18, 2023 at 4:03 pm
Zoelle Wong
Subscriber -
October 18, 2023 at 9:19 pm
Federico
Ansys EmployeeHello,
I'm not sure I understand physically what you're trying to do. If your model is axissymmetric, then there cannot be a wall.
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October 19, 2023 at 4:02 pm
Zoelle Wong
Subscriberessentially, I'm trying to model a hot rod inside the nozzle, but with an axis BC applied at the line of symmetryÂ
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?
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October 19, 2023 at 7:08 pm
Federico
Ansys EmployeeRight, 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.
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October 19, 2023 at 7:15 pm
Zoelle Wong
SubscriberOk; 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).
Â
Do you know what this is related to? I'm making my mesh via Pointwise instead of ANSYS' internal meshing toolÂ
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October 19, 2023 at 7:49 pm
Zoelle Wong
SubscriberI think I figured it out - but it's not the best solution. What are your thoughts on the following (thank you again so much):Â
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:Â
*first image is a diagram of the mesh+BC; 2nd /3rd imags are contour plotsÂ
Â
Â
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October 19, 2023 at 7:54 pm
Federico
Ansys EmployeeDoes this wall have a wall/shadow pair? This is required for heat transfer between different materials.Â
If you don't see this in your boundaries zones, try the following command in the TUI console:
define/boundary-conditions/modify-zones/slit-face-zone
then enter the Face ID of that boundary.
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- The topic ‘Defining an isothermal wall next with axis boundary condition’ is closed to new replies.
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