CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   simulation of stirred tanks (http://www.cfd-online.com/Forums/main/3159-simulation-stirred-tanks.html)

hu February 21, 2001 12:50

simulation of stirred tanks
 
Hi, everybody,

I intend to simulate a stirred tank with Rushton-impellers using a snapshot method proposed by prof.Ranade. Has anyone tried this method?

He thought the mass sink Sm=-Rho * Abc * Wbc ( Abc and Wbc are the area of the computation cell adjacent to the back side of the blade and rotational velocity of blade respetively) and mass source Sm1= - Sm for the compuatation cell adjacent to the front side of the blade, which means Wbc = Omega * r ( r is the radius of the computation cell). However when I add the mass source and sink into the pressure equation, (by su=su+sm) and I add the corrosponding source terms and sink terms into the momentum equations ( by su=su+sm*phi, phi is U, V, W velocities of the last iteration). However, I found the results are not reasonable because all velocity components are greater than the experiment data (the maximum velocity is 9.0Utip).

Who can tell me what's wrong?

Thanks in advance.


All times are GMT -4. The time now is 09:01.