| AybarsSeyhan |
January 14, 2024 08:05 |
Openfoam Post Processing Cumulative Drag
2 Attachment(s)
Hello, I am doing a project about drag reduction devices for US Trucks. I am trying to add some cumulative drag plots too. But in my graphs it seems like the Cd is decreasing between the truck and the trailer. All the paper that i read says that it should increase due to the pressure difference. I also tested it with vortex traps set in front of the trailer. I am attaching my forceCoeffs file and my graphs. Can you give me feedback about what could went wrong or did i get wrong results.
Thank you all
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v2306 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
forceCoeffs1
{
type forceCoeffs;
libs (forces);
writeControl timeStep;
timeInterval 1;
log yes;
writeFields yes; // Store and write volume field representations of forces and moments
patches (truckbase symmetry);
rho rhoInf; // Indicates incompressible
rhoInf 1; // Required when rho = rhoInf
liftDir (0 0 1);
dragDir (1 0 0);
CofR (0 0 0); //The point around which your torque will be calculated.
pitchAxis (0 1 0);
magUInf 24.5872; // INPUT SPEED INITIAL
lRef 20.315; // Wheelbase length the longest line in the x direction will be the lRef.
Aref 5.196; //10.392;
/* binData
{
nBin 50; // output data into 20 bins
direction (1 0 0); // bin direction
cumulative yes;
}*/
}
binField1
{
type binField;
libs (fieldFunctionObjects);
binModel singleDirectionUniformBin;
fields (forceCoeff);
patches (truckbase);
decomposePatchValues true;
CofR ${../forceCoeffs1/CofR};
binData
{
nBin 50; //
direction (1 0 0); // bin direction
cumulative yes;
}
writeControl timeStep;
}
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