# Couette flow with nonNewtonianicoFoam

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

 September 25, 2008, 09:58 Hello, I want to model a Co #1 Member   florian Join Date: Mar 2009 Location: Mannheim - Vincennes - Valenciennes, Deutchland - France Posts: 34 Rep Power: 8 Hello, I want to model a Couette flow. With a newtonian flow all work fine, the velocity profile fell linear. But when I use a nonNewtonian Flow the solution converge towards a bad result. My 2D model is a rectangle 80mmx8mm - The top wall velocity is 0 The bottom wall velocity is 0,21 m/s dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { frontAndBackPlanes { type empty; } outlet { type zeroGradient; } inlet { type zeroGradient; } top { type fixedValue; value uniform (0 0 0); } bottom { type fixedValue; value uniform (0.21 0 0); } } - inlet pressure 1Pa/rho dimensions [0 2 -2 0 0 0 0]; internalField uniform 1; boundaryField { frontAndBackPlanes { type empty; } outlet { type fixedValue; value uniform 1; } inlet { type zeroGradient; } top { type zeroGradient; } bottom { type zeroGradient; } } nuo=250 m2/s gamma0=1 s-1 n=0.4 I plot the result : http://www.imagup.com/imgs/1222358528.html Why my pressure profile is not constant. Thanks, Florian

 September 29, 2008, 03:38 According to these equations I #2 Member   florian Join Date: Mar 2009 Location: Mannheim - Vincennes - Valenciennes, Deutchland - France Posts: 34 Rep Power: 8 According to these equations I should have a linear profit couette laminaire Can someone help me ?

 December 7, 2010, 06:39 #3 Senior Member   Join Date: Sep 2010 Location: France Posts: 193 Rep Power: 6 Hi, how did you do the Geometry?

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post thiagobaixo CFX 20 April 2, 2008 19:46 jbssastry FLUENT 2 March 6, 2007 08:58 Tex FLUENT 1 November 30, 2005 05:47 Vijay Patel Main CFD Forum 2 April 18, 2002 11:29 MURALI.K.P Main CFD Forum 3 June 9, 2000 12:03

All times are GMT -4. The time now is 22:42.