|
[Sponsors] |
Viscous Driven Compressible Flow Boundary Condition |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
January 22, 2019, 10:03 |
Viscous Driven Compressible Flow Boundary Condition
|
#1 |
New Member
Tom
Join Date: Nov 2018
Posts: 23
Rep Power: 7 |
Hi everyone,
I have been developing a fluid solid interaction (FSI) code with a compressible fluid solver with cavitation, and I am looking for some advice on proper boundary conditions to use. The flow that I am simulating is entirely viscous driven - there is no set pressure differential or across the domain, and the only fluid movement comes from two moving walls (one translatingWallVelocity and one rotatingWallVelocity). I have done very similar cases with an incompressible fluid solver, and have had success with setting the inlet as a 'zeroGradient' and outlet as 'fixedValue' of 0. I cannot use these boundary conditions for the compressible flow case because of the cavitation model - the minimum pressure when accounting for cavitation is the liquid's vapor pressure (around 4500 pa). So far, I have tried using two 'totalPressure' boundary conditions that set both the inlet and the outlet to 1.1e5 pa, around atmospheric pressure. I have also tried setting both the inlet and the outlet to 'zeroGradient'. Both of these cases gave very similar results - very little pressure build up in the narrow region, and a large pressure differential between the sides. I have attached an image of my domain with the pressure contours from the dual 'zeroGradient' boundary condition case. I am wondering what the best boundary conditions would be for this case. Reading through the B.C. documentation on openFoam.com and DOxygen, I think I might try using a 'freeStream' condition or a combination of 'inletOutlet' / 'outletInlet' conditions. Does anyone have any advice / suggestions for what to try next? Any help is appreciated!! Thanks! |
|
Tags |
boundary conditions, compressible fsi, fluid solid interface, viscous flow |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Centrifugal fan | j0hnny | CFX | 13 | October 1, 2019 13:55 |
Low Mixing time Problem | Mavier | CFX | 5 | April 29, 2013 00:00 |
How to set the velocity inlet boundary condition in the compressible flow? | lienien | FLUENT | 2 | March 11, 2013 08:25 |
Boundary condition for compressible flow ( cavity lid problem) | pike@91 | Main CFD Forum | 2 | June 2, 2012 17:04 |
ATTENTION! Reliability problems in CFX 5.7 | Joseph | CFX | 14 | April 20, 2010 15:45 |