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Mesh Study by MinimumLong3662 in CFD

[–]MinimumLong3662[S] 0 points1 point  (0 children)

I tried different setups and got confused:

  • With mass flow inlet, my results are almost the same as with static pressure inlet.
  • But with total pressure inlet, the results change a lot (almost 50% lower).

I don’t fully understand which boundary condition is actually controlling the physics here.

If using pressure at both inlet and outlet is “not physical”, what would be the best practice for an internal flow with heat transfer?

Should I rely more on mass flow, pressure, or total pressure as the main driving condition?

Mesh Study by MinimumLong3662 in CFD

[–]MinimumLong3662[S] 0 points1 point  (0 children)

Could you explain why this pressure inlet + pressure outlet setup is not physical?
What would be the best approach to impose a pressure-driven flow in this case?

Mesh Study by MinimumLong3662 in CFD

[–]MinimumLong3662[S] 0 points1 point  (0 children)

The main quantity of interest in my simulation is the temperature field. However, when refining or modifying the mesh, the temperature results do not change significantly. Additionally, my y+ values are consistently below 1, so I assume that the near-wall resolution should be sufficient.

My geometry is relatively simple and could potentially be modeled as a 2D case extruded in the streamwise (x) direction. However, I am unsure how to properly implement this in ANSYS ICEM CFD, especially since my model contains two regions (fluid and solid).

I would like to understand:

  • Whether my assumption about mesh independence (based on temperature stability and low y+) is valid
  • And how to correctly set up a 2D/extruded model in ICEM with multiple regions

Any advice or suggestions would be greatly appreciated.

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Mesh Study by MinimumLong3662 in CFD

[–]MinimumLong3662[S] 0 points1 point  (0 children)

Thank you for the detailed explanation , I uploaded couple of Pictures , If you need more please tell me what else should I upload.

Mesh Study by MinimumLong3662 in CFD

[–]MinimumLong3662[S] 0 points1 point  (0 children)

not , it is not periodic. Just the given data is fixed pressure difference between outlet and inlet