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August 8, 2011, 13:35 |
Compressible flow modeling in Fluent
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#1 |
New Member
Nik
Join Date: Mar 2010
Location: Michigan
Posts: 25
Rep Power: 16 |
Hello,
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 Error: 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? Thanks, Nikhil |
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August 8, 2011, 13:55 |
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#2 |
New Member
Pavel Staša
Join Date: Apr 2010
Location: Czech Republic
Posts: 9
Rep Power: 16 |
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. |
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August 8, 2011, 14:16 |
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#3 |
New Member
Nik
Join Date: Mar 2010
Location: Michigan
Posts: 25
Rep Power: 16 |
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. |
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August 8, 2011, 16:55 |
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#4 |
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Vijay
Join Date: Mar 2009
Posts: 21
Rep Power: 17 |
You cannot have velocity and pressure boundary condiitons in a single domain...I guess
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August 9, 2011, 05:24 |
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#5 |
New Member
Pavel Staša
Join Date: Apr 2010
Location: Czech Republic
Posts: 9
Rep Power: 16 |
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." |
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August 9, 2011, 05:30 |
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#6 | |
New Member
Pavel Staša
Join Date: Apr 2010
Location: Czech Republic
Posts: 9
Rep Power: 16 |
Quote:
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. |
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August 9, 2011, 08:07 |
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#7 |
New Member
Karl Kargl
Join Date: Mar 2009
Location: Austria
Posts: 9
Rep Power: 17 |
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. Best Regards |
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August 9, 2011, 09:57 |
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#8 | |
New Member
Pavel Staša
Join Date: Apr 2010
Location: Czech Republic
Posts: 9
Rep Power: 16 |
Quote:
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. |
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August 9, 2011, 15:18 |
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#9 |
New Member
Nik
Join Date: Mar 2010
Location: Michigan
Posts: 25
Rep Power: 16 |
Thanks all...
With mass flow inlet and pressure outlet my case is running smoothly. |
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