Compressible flow modeling in Fluent
I have few questions on compressible flow modeling in Fluent
1. Can i use velocity inlet and pressure outlet BCs while modeling compressible flow?
2. Can i use pressure based solver to model the compressible flow?
3. I am using velocity inlet, pressure outlet in one of my cases and pressure based solver. However, when i initialize the solution, i am getting this error message
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: #f
can anyone please explain why am i getting such error message and how to overcome it?
For questions one and two my answer is YES.
For last one, my oppinion is that mesh might be wrong or type of other BC are wrong.
If I´m wrong, correct me.
Mesh is pretty much simple and without any error.
Its a 2D domain. Therefore apart from inlet and outlet; other two boundaries are walls which are fine from my consideration.
You cannot have velocity and pressure boundary condiitons in a single domain...I guess
My apology. I really thought that velocity inlet can be used for compressible flow but there is a explanation in Fluent manual.
Velocity inlet BC:
"This boundary condition is intended for incompressible flows, and its use in compressible flows will lead to a nonphysical result because it allows stagnation conditions to float to any level. You should also be careful not to place a velocity inlet too close to a solid obstruction, since this could cause the inflow stagnation properties to become highly non-uniform."
You can use three combinations of BC at the inlet and outlet.
1. Velocity inlet - Outflow
2. Velocity inlet - Pressure outlet
3. Pressure inlet - Pressure outlet
Instead of velocity inlet you can use mass flow inlet too, of course.
For compressible flows only two combinations are valid:
1. Mass Flow Inlet + Pressure Outlet
2. Pressure Inlet + Pressure Outlet
Velocity Inlet and Outflow are incorrect BC's for modeling compressible flows with FLUENT.
Of course, I mean generally you can use velocity inlet and Outflow, not for case of combressible flows.
Velocity Inlet is incorrect and Outflow is incorrect too for compressible flows.
With mass flow inlet and pressure outlet my case is running smoothly.
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