Hydrostatic pressure in stagnation pressure from Advance Boundaries

Gart04

Hi 

I need to apply Hydrostatic Pressure from Advance Boundaries to a Stagnation Pressure and i do not have access to the Hydrostatic Pressure as i have when i click directly on Stagnation Pressure. Any ideas ?

Thanks, best regards

acupro

You are correct, though hydrostatic_pressure (and related parameters) is allowed in the ELEMENT_BOUNDARY_CONDITION command with variable = pressure or stagnation_pressure, it is not yet implemented in HyperWorks CFD.

What prevents you from using the 'standard' boundary types to apply stagnation pressure with hydrostatic pressure?  I'm assuming the reason is that you want to apply the piecewise-linear NBC for temperature on that boundary - which then removes the surface from the standard boundary types (limitation in HWCFD - which hopefully will be corrected in the next release cycle).

At present, either way you will need to hand-edit the exported input file prior to launching the simulation.

I typically assign the NBC through the Advanced Boundaries - as manually extracting the nodes from the surface is a bit complicated. Then I add a Surface Output (monitor) such that the input file includes the surface(s) definition I can then use to manually add the Simple Boundary Condition on that surface.

After manually-editing the input file, we can run from command-line or the Compute Console.

acupro

You are correct, though hydrostatic_pressure (and related parameters) is allowed in the ELEMENT_BOUNDARY_CONDITION command with variable = pressure or stagnation_pressure, it is not yet implemented in HyperWorks CFD.

What prevents you from using the 'standard' boundary types to apply stagnation pressure with hydrostatic pressure?  I'm assuming the reason is that you want to apply the piecewise-linear NBC for temperature on that boundary - which then removes the surface from the standard boundary types (limitation in HWCFD - which hopefully will be corrected in the next release cycle).

At present, either way you will need to hand-edit the exported input file prior to launching the simulation.

I typically assign the NBC through the Advanced Boundaries - as manually extracting the nodes from the surface is a bit complicated. Then I add a Surface Output (monitor) such that the input file includes the surface(s) definition I can then use to manually add the Simple Boundary Condition on that surface.

After manually-editing the input file, we can run from command-line or the Compute Console.

Gart04

Yes you are right,  the reason is that i want to apply the piecewise-linear NBC for temperature on that boundary.

Thanks a lot for your help, so it's the same methodology that my previous question last week. I understand, i try.

Best regards, 

acupro

Gart04 said:

Yes you are right,  the reason is that i want to apply the piecewise-linear NBC for temperature on that boundary.

Thanks a lot for your help, so it's the same methodology that my previous question last week. I understand, i try.

Best regards, 

You may also want to try applying the standard BC first (stagnation pressure with hydrostatic pressure and origin) - then export the solver deck.  This will give you the Simple Boundary Condition you can save/copy - to insert into the input file after you add the Advanced BC and export again.

Gart04

acupro_21778 said:

You may also want to try applying the standard BC first (stagnation pressure with hydrostatic pressure and origin) - then export the solver deck.  This will give you the Simple Boundary Condition you can save/copy - to insert into the input file after you add the Advanced BC and export again.

Ok thanks a lot