 |
 |
 |
|
|
|
[Sponsors] | ||||
May 18, 2013, 04:28
|
Forces and moments
|
#1 |
|
New Member
Sture Smidt
Join Date: Mar 2013
Posts: 27
Rep Power: 13  |
Hi,
I am analyzing a body of revolution, 1.1 m long and 0.16 m diameter. I use the freestream boundary condition. functions { forces { type forceCoeffs; functionObjectLibs ( "libforces.so" ); outputControl timeStep; outputInterval 25; patches ( body ); // the <body> is a group of patches pName p; UName U; rhoName rhoInf; // Indicates incompressible log true; rhoInf 1.225; // Redundant for incompressible liftDir (0 0 1); dragDir (1 0 0); CofR (0 0 0); // Axle midpoint on ground pitchAxis (0 1 0); magUInf 10; lRef 3; // Wing root cord Aref 0.0707; // Estimated } } However, I get very strange lift and drag results a an alfa of 0, 5 and 10 degrees. The drag values are reasonable, but the lift is very small. I use the body-referenced coordinate system for lift and drag directions. Are the lift and drag force supposed to be summed for all the pathches in the group <body>? The thing is, they do not. I have summed for all the patches manually and then the results matches wind tunnel results pretty good (for CFD results). SS Last edited by sture; May 25, 2013 at 07:08. |
|
|
|
|
 |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Ensight: Visualizing forces and moments | David | EnSight | 3 | December 19, 2012 13:47 |
| Workbench 12.1 reaction forces and moments in response spectrum | KOHCTPYKTOP | ANSYS | 0 | November 12, 2011 04:42 |
| forces and moments | nico | Main CFD Forum | 0 | January 28, 2008 07:25 |
| Compute CEs from moments and forces | nico | Main CFD Forum | 1 | August 6, 2007 19:19 |
| Hydrodynamic forces and moments on submarines | Peo Hedin | Main CFD Forum | 2 | July 20, 1999 02:53 |
Linear Mode
