|
[Sponsors] |
January 12, 2011, 06:52 |
Cylindrical Boundary Conditin
|
#1 |
Senior Member
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 255
Rep Power: 16 |
Hi there
A fluid flow which has a streamwise velocity component (along X axis) and a tangential (spiral) velocity component (around X axis), enters a pipe. Streamwise velocity component: 0.12 [m/sec]*(1-(r/1.5 [mm])^2) tangential velocity component: 0.06* r/6*1.5 [mm] radial velocity component: 0 in "Boundary details", I choose Cyl.Vel. Component option and enter the above expressions for the velocity components. In axis definition, I choose "Coordinate axis" option but I don’t know which axis should be selected for "Rotation axis". If entering flow rotates around X axis, X axis should be chosen as "Rotation axis"? I have another problem about Reynolds number. when I calculate the Reynolds number at inlet, it would be about 100, but when I check the velocity and Reynolds number in "Average Scale Information" in CFX Solver, their values are too large.(7*1E+5 [m/s],2.4*1E+6]. This issue causes my solution to be diverged. Please let me know why "CFX Solver" shows large values for Reynolds and Velocity? Finally, I don’t know in "Basic Setting" of inlet boundary condition, whether "Coord frame" option should be selected for my problem or not? Regards, Ashtonj |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Implementation of boundary conditions for FVM | Tom | Main CFD Forum | 7 | August 26, 2014 05:58 |
RPM in Wind Turbine | Pankaj | CFX | 9 | November 23, 2009 04:05 |
CFX doesn't continue calculation... | mactech001 | CFX | 6 | November 15, 2009 21:25 |
Boundary conditions? | Tom | Main CFD Forum | 0 | November 5, 2002 01:54 |
Boundary Conditions | Jan Ramboer | Main CFD Forum | 11 | August 16, 1999 08:59 |