|August 31, 2012, 04:27||
Back flow problem in gas cyclone
Join Date: Oct 2010
Posts: 20Rep Power: 6
I'm working on Stairmand high efficiency cyclone model. I have a problem that I am getting back flow in the central region, from vortex finder. I am using unsteady RSM model with standard wall function (I have also tried the enhanced wall treatment option); with velocity inlet for inlet, outflow for flow outlet, and walls for dustbin and other walls as the Boundary Conditions. For pressure-velocity coupling I am using SIMPLE (I have also used SIMPLEC). For others it is PRESTO, QUICK, 2nd order, 2nd order. For RSM it is 1st order. I'm using Fluent v14, and I have meshed using GAMBIT as well as ICEM CFD, but I am getting the same results. The tangential velocity profile is fine. My problem is the back flow at the outlet (vortex finder). I am still struggling with single phase flow (no Discrete Phase Model introduced yet).
Can anybody please help me to get rid out of it. I have also tried to extended the outlet (vortex finder) length upto 5 times the diameter so that the flow is fully developed and there is no back flow, but still the results are same.
Do I need to work on some coding (in the form of .udf) to eliminate this?
I am stuck to this problem since last 3 months. Looking forward for your positive response.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Multiphase phase (gas-solid) flow using Eulerian-Granular medel ( divergence problem)||jessie||FLUENT||3||May 29, 2014 11:05|
|Boundary condition problem for open channel flow||Andy||CFX||8||October 1, 2012 07:45|
|gas solid flow problem validation||pandaba||FLUENT||0||October 27, 2010 06:05|
|source term in a gas mixture problem||Kevin||CD-adapco||0||March 27, 2008 06:55|
|cyclone problem||Jichun||FLUENT||4||May 16, 2002 04:43|