|May 8, 2016, 08:12||
Backwards-Facing STEP: SIMPLEC vs Coupled Algorithms
Join Date: Nov 2015
Posts: 8Rep Power: 3
I am simulating a turbulent channel flow over a backwards-facing step. I have chosen to use RANS + standard k-w turbulence model (with low-Re corrections).
My flow conditions are those from:
Driver, D. & Seegmiller, H., 1985. Features of a reattaching turbulent shear layer in divergent channel flow. AIAA Journal, 23(2), pp. 163-171.
with an inlet pipe length of 1m, outlet pipe length of 5.5m and a step height of 1.27cm.
When I increase my mesh density such that y+ = 1, the SIMPLEC algorithm generates a converged solution only after about 18k iterations whereas the Coupled algorithm only after 3k iterations. In both cases I am using QUICK interpolation schemes. I have compared the two solutions and they are identical.
I know that once low-Re corrections are enabled a converged solution is obtained harder as the equations for k-w are integrated in the boundary layer as well but what I don't understand is why SIMPLEC is slower than the Coupled algorithm. I am simulating an incompressible flow so it shouldn't be the case. I am suspecting that it may be due to the choice in turbulence modelling but I am not sure.
Does anyone know any other potential causes for this?
|coupled, k-w-standard convergece, simplec, turbulence modelling|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Star cd es-ice solver error||ernarasimman||STAR-CD||2||September 12, 2014 00:01|
|Help for the small implementation in turbulence model||shipman||OpenFOAM Programming & Development||25||March 19, 2014 11:08|
|Laminar simulation with Simple Algorithms and Coupled Algorithms.||lienien||FLUENT||4||April 30, 2013 11:15|
|Rearward facing step simulations||siw||FLUENT||1||September 23, 2009 02:21|
|backward facing step problem||Yung-Ming Chen||Main CFD Forum||3||May 11, 1999 22:04|