|June 20, 2016, 12:02||
Flow over a cavity inconsistent
Join Date: Jun 2016
Posts: 8Rep Power: 2
I have been running through Fluent simulations for flow over a cavity to study self-oscillating cavity flows. So far with cavities that have a cavity opening length (L) less than that of the cavity depth (D) I get results consistent with available experimental data and exhibit very periodic oscillations. However, simulations that have a L/D>1 exhibit very random time histories inconsistent with experiment.
I am using DES SST k-omega solver, y+=1, second order settings, time step is 0.008 for 100-150 seconds, core flow is around 2cm/s. Most everything else is default.
From literature there is a difference in flow regime for deep cavity flow (L/D<1) and shallow cavity flow (L/D>1). Deep cavities act like resonators with the shear layer acting as a forcing mechanism. Shallow cavities oscillate due to propagating disturbances amplified through the shear layer.
Any ideas for how I can try and capture this shallow cavity flow regime behavior?
|cavity flow, des, fluent, oscillations|
|Thread||Thread Starter||Forum||Replies||Last Post|
|2D Lid Driven Cavity Flow simulation using MATLAB||josephlm||Main CFD Forum||3||June 24, 2010 01:58|
|Reynolds Number matching in Cavity flow||Endee||Main CFD Forum||6||April 20, 2010 04:47|
|basic blockMesh : manipulate the lid-driven cavity flow tutorials||Lexa||OpenFOAM Meshing & Mesh Conversion||2||November 12, 2009 22:15|
|Supersonic Flow over a Cavity (coodles): Maximum Iterations Exceeded||sushant||OpenFOAM Running, Solving & CFD||0||April 9, 2009 02:52|
|Inviscid Drag at subsonic, subcritical Mach #||Axel Rohde||Main CFD Forum||1||November 19, 2001 13:19|