请问openfoam下如何算升阻力系数
这个问题困扰我很久了，一直都得不到满意的答复。我在算一个圆柱绕流问题，想要得到升阻力及系数的情况，之前有人看到网上有人说用function object功能，然后我照着别人的办法设置controlDick文件，但是输出结果只有U和P，并没有我要的升力和阻力，请问有人能告诉我这是什么情况么？我该如何着手？或者说计算升阻力有没有别的办法？希望有达人能详细的介绍一下，不胜感激！ /*--------------------------------*- C++ -*----------------------------------*\| ========= | |
| \\ /F ield | OpenFOAM: The Open Source CFD Toolbox |
|\\ / O peration | Version:1.6 |
| \\/ A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation| |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location system;
object sampleDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Set output format : choice of
// xmgr
// jplot
// gnuplot
// raw
setFormat raw;
// Surface output format. Choice of
// null : suppress output
// foamFile : separate points, faces and values file
// dx : DX scalar or vector format
// vtk : VTK ascii format
// raw : x y z value format for use with e.g. gnuplot 'splot'.
//
// Note:
// other formats such as obj, stl, etc can also be written (by proxy)
// but without any values!
surfaceFormat raw;
// interpolationScheme. choice of
// cell : use cell-centre value only; constant over cells (default)
// cellPoint : use cell-centre and vertex values
// cellPointFace : use cell-centre, vertex and face values.
// 1] vertex values determined from neighbouring cell-centre values
// 2] face values determined using the current face interpolation scheme
// for the field (linear, gamma, etc.)
interpolationScheme cellPoint;
// Fields to sample.
fields
(
p
);
// Set sampling definition: choice of
// uniform evenly distributed points on line
// face one point per face intersection
// midPoint one point per cell, inbetween two face intersections
// midPointAndFace combination of face and midPoint
//
// curve specified points, not nessecary on line, uses
// tracking
// cloud specified points, uses findCell
//
// axis: how to write point coordinate. Choice of
// - x/y/z: x/y/z coordinate only
// - xyz: three columns
//(probably does not make sense for anything but raw)
// - distance: distance from start of sampling line (if uses line) or
// distance from first specified sampling point
//
// type specific:
// uniform, face, midPoint, midPointAndFace : start and end coordinate
// uniform: extra number of sampling points
// curve, cloud: list of coordinates
sets
(
);
// Surface sampling definition: choice of
// plane : values on plane defined by point, normal.
// patch : values on patch.
//
// 1] patches are not triangulated by default
// 2] planes are always triangulated
// 3] iso-surfaces are always triangulated
surfaces
(
airfoil
{
type patch; // always triangulated
patchName Airfoil;
}
slat
{
type patch;
patchName Slat;
}
);
// *********************************************************************** //
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