# Help!!!

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

 August 25, 2003, 23:41 Help!!! #1 Miko Guest   Posts: n/a Hi all! If the momentum source added in subdomain is very sensible to the velocity, such as the momentum is equal to "c*velocity", and the coefficient "c" is quite large, what should do to set to make CFX solver to converge?

 August 27, 2003, 15:23 Re: Help!!! #2 Robin Guest   Posts: n/a Miko, Add a momentum source coefficient equal to "c", the solver will use this to linearize the equations. Also, if 'c' is positive, the solver will blow up on you. When multiplying by velocity, you should only use negative (resistive) coefficients. Regards, Robin

 August 27, 2003, 20:44 Re: Help!!! #3 Miko Guest   Posts: n/a Dear Robin, Thank you very much! You are really a good people! I think my problem can't be solved by setting a linear resistibility, for the momemtum sources at different direction are different. For instance, x-component is 0, but y-component and z-component are both c*velocity. So how to deal with it? Best regards! Miko

 August 28, 2003, 15:42 Re: Help!!! #4 Robin Guest   Posts: n/a There is only one entry for the source coefficient, use whichever c is largest. Robin

 August 29, 2003, 03:00 Re: Help!!! #5 Miko Guest   Posts: n/a Hi Robin, I think I can try! Thank you! Best regards! Miko

 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

All times are GMT -4. The time now is 10:39.