natural-convection using HM-CFD

Junta_20361

hello guys,

I am getting a trouble while performing a simulation on HM-CFD-AcuSolve.

The simulation in this case is Natural-convection (Acu-3000 in AcuSolve tutorials).

when i completed on AcuConsole (following tutorials), the result was OK.

But when performing on HM-CFD, the heat from the inner solid does not transfer to the surrounding area (air). So the simulation falied.

my version is Engineering solutions 2017.3 and AcuSolve 2018 (downloaded from Altair connect).

I tried to check on .INP file generated by both software (AcuConsole and HM-CFD) for the differences but no result.

i also add the following command to .INP file (HM-CFD) to make sure the surface transfer heat:

wall_function_heat_flux_factor = 1

but nothing work.

Does anybody know about this situation?

please help.

Appreciate. Thank you!

P/S: the HM-CFD file is in attached, either the AcuConsole database (.Acs). please view and help me.

<?xml version="1.0" encoding="UTF-8"?>

Unable to find an attachment - read this blog

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ydigit

The AcuConsole model uses periodicity in Z direction and has only one element 'thickness' in Z-direction. The model generated in HyperMesh is not using periodicity, and it has two elements in the Z-direction, as seen in the screenshot above.

Junta_20361

The AcuConsole model uses periodicity in Z direction and has only one element 'thickness' in Z-direction. The model generated in HyperMesh is not using periodicity, and it has two elements in the Z-direction, as seen in the screenshot above.

Thanks for your reply!

I recognized that when meshing for model.

But i didn't know that mesh type by HM affected the simulations.

i can not find any tools in HM (mesh control) to create this kind of mesh. In AcuConsole, it is mesh extrusion.

Then i tried to create mesh manually but it tooks a lot of time to get the mesh as AcuConsole. AcuConsole completed this task within a few minutes.

i also created Periodic Boundary Condition in HM model and assign it to components in Z-direction. Does this 2 functions (Periodic BC and Periodics) are similar?

Can you advice me for any solution?

Thanks and regard!

acupro

I'm not sure of the process, but I would suggest you make sure there is just one set of nodes at the surface between the solid and the fluid. That single set of nodes should be shared by the volume elements of both the solid and the fluid. If all the boundary conditions are the same, the image leads me to think the fluid and solid are not connected - that there may be two sets of nodes - one for the solid and another for the fluid - when the nodes should be shared. In that case, there would be no heat transfer path from the solid to the fluid.

Junta_20361

I'm not sure of the process, but I would suggest you make sure there is just one set of nodes at the surface between the solid and the fluid. That single set of nodes should be shared by the volume elements of both the solid and the fluid. If all the boundary conditions are the same, the image leads me to think the fluid and solid are not connected - that there may be two sets of nodes - one for the solid and another for the fluid - when the nodes should be shared. In that case, there would be no heat transfer path from the solid to the fluid.

thank for your comment.

i will try to follow your instruct!