|
[Sponsors] |
August 7, 2018, 14:52 |
Problem with Lift and Drag coeffs
|
#1 |
New Member
Join Date: May 2018
Posts: 1
Rep Power: 0 |
Hello, everyone
Is my first time asking here. I have searched an answer for my questions in every previous thread but I could not find it, so here I go: Im simulating an USV (Unmanned Surface Vessel), multiphase, with interFoam. My intention is to obtain Lift and Drag coefficients, but, I do not know why, I keep getting ridiculous numbers: Cm = -1.22607e-299 Cd = 5.39348e-300 Cl = 8.5342e-300 Cl(f) = -7.99359e-300 Cl(r) = 1.65278e-299 I am also calculation forces, and they seem pretty correct, at least their magnitude does (-5.713676e+01 6.513626e+02 1.482553e+03) I have checked my Aref (frontal Area in m2), lRef (hull length), magUinf (free stream velocity), rhoInf... forcesCoeffs { type forceCoeffs; functionObjectLibs ( "libforces.so" ); outputControl timeStep; outputInterval 1; patches (hull); pName p; UName U; log true; rhoInf 1025; CofR (1.067 0 0.0725) liftDir (0 0 1); dragDir (-1 0 0); pitchAxis (0 1 0); magUInf 3.0684; lRef 2.27; Aref 0.05; } Does anyone know what could be making me get so low coeffs? Is there any other parameter affecting? I have also tried modifying the mesh, timeStep... Thank you very much in advance |
|
Tags |
coefficients, drag, hull, interfoam, lif |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
How to plot drag and lift coeffs. | m5m5kh | OpenFOAM Post-Processing | 10 | April 26, 2022 00:37 |
Calculation of lift and drag coefficients on airfoil | CoolHersheys | OpenFOAM Post-Processing | 5 | September 27, 2021 07:04 |
wrong SU2 calculation for lift and drag coefficient for NAC4421 | mechy | SU2 | 7 | January 9, 2017 06:18 |
Lift maximization Drag constrained problem. | zkdkeen | SU2 Shape Design | 1 | January 16, 2015 03:46 |
lift and drag ceofficient problem | icemaniac178 | CFX | 6 | August 17, 2011 19:40 |