CFD Online Logo CFD Online URL
Home > Forums > CFX

Multiphase flow convergence problems

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   July 12, 2007, 16:01
Default Multiphase flow convergence problems
Posts: n/a

I'm trying to model a a shear flow into a cylindrical chamber. At one end, there are two inlets, one of which is a liquid, the other is a variable composition gas, with an outlet at the other end of the cylinder.

The gas enters at high temperature and velocity, and the liquid at low temperature and velocity. The outlet has been set to an opening condition with static pressure.

I've tried just about everything to get the simulation to converge, varied the timestep, tried upwind and high resolution advection, and I've reduced the complexity of the model from a complete simulation with heat and mass transfer down to a simplified fluid dependant isothermal model.

Even with an increased resolution of the mesh (structured) the residuals just hang and oscillate about constant values. Its possible the flow is oscillatory in nature, but a qualitative inspection of the flow in cfx-post shows a definate non-physical anomoly.

Any ideas?
  Reply With Quote

Old   July 12, 2007, 21:18
Default Re: Multiphase flow convergence problems
Glenn Horrocks
Posts: n/a

This topic has been discussed many times. Read the documentation about obtaining convergence. It sounds like your simulation has a minor transient component which is preventing full convergence.

Glenn Horrocks
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Convergence Centurion2011 FLUENT 44 June 20, 2017 09:57
Multiphase Flow - Convergence Problems bastian26 FLUENT 0 September 19, 2011 07:26
[ICEM] Problems with coedge curves and surfaces tommymoose ANSYS Meshing & Geometry 0 August 5, 2011 16:02
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24
Weak rotational flow - Convergence Problems Daggemann FLUENT 1 May 8, 2009 09:45

All times are GMT -4. The time now is 15:14.