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发表于 2013-3-21 09:09:16
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来自 江苏无锡
coolwolf0100 发表于 2013-3-21 08:39
对于求通量这个问题,我想到的解决思路是这样的:先把单元面上的速度求解出来,F_U(f,t),F_V(f,t),F_W( ...
我就是不明白,Fluent为什么会搞得这么麻烦。
下面是fluent帮助中UDS flux的UDF,它倒不存在通量的方向问题,你看看,能否解释:
/**********************************************************************/
/* UDF that implements a simplified advective term in the */
/* scalar transport equation */
/**********************************************************************/
#include "udf.h"
DEFINE_UDS_FLUX(my_uds_flux,f,t,i)
{
cell_t c0, c1 = -1;
Thread *t0, *t1 = NULL;
real NV_VEC(psi_vec), NV_VEC(A), flux = 0.0;
c0 = F_C0(f,t);
t0 = F_C0_THREAD(f,t);
F_AREA(A, f, t);
/* If face lies at domain boundary, use face values; */
/* If face lies IN the domain, use average of adjacent cells. */
if (BOUNDARY_FACE_THREAD_P(t)) /*Most face values will be available*/
{
real dens;
/* Depending on its BC, density may not be set on face thread*/
if (NNULLP(THREAD_STORAGE(t,SV_DENSITY)))
dens = F_R(f,t); /* Set dens to face value if available */
else
dens = C_R(c0,t0); /* else, set dens to cell value */
NV_DS(psi_vec, =, F_U(f,t), F_V(f,t), F_W(f,t), *, dens);
flux = NV_DOT(psi_vec, A); /* flux through Face */
}
else
{
c1 = F_C1(f,t); /* Get cell on other side of face */
t1 = F_C1_THREAD(f,t);
NV_DS(psi_vec, =, C_U(c0,t0),C_V(c0,t0),C_W(c0,t0),*,C_R(c0,t0));
NV_DS(psi_vec, +=, C_U(c1,t1),C_V(c1,t1),C_W(c1,t1),*,C_R(c1,t1));
flux = NV_DOT(psi_vec, A)/2.0; /* Average flux through face */
}
/* ANSYS FLUENT will multiply the returned value by phi_f (the scalar's
value at the face) to get the "complete'' advective term. */
return flux;
} |
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