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zzh19920530

新虫 (小有名气)

应助: 0 (幼儿园)
金币: 268.5
散金: 50
红花: 2
帖子: 146
在线: 76.7小时
虫号: 3656633
注册: 2015-01-21

[求助] 给fluent换背景颜色，温度梯度值为什么不显示了已有3人参与

给fluent换背景颜色，温度梯度值为什么不显示了，之前fluent的背景颜色是浅蓝色的，但是后来我把背景颜色换成了白色的，然后我温度云图里的温度梯度值就没了，如下图所示。还能把温度梯度值调回来吗？

bai.png

lan.png

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1楼 2015-03-26 18:57:57

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1049484471

新虫 (初入文坛)

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【答案】应助回帖

感谢参与，应助指数 +1

求助，下面的程序是什么意思？中间的数据我省略了，谢过！

/**************************************************************************************
UDF: for specifying a time-dependent velocity profile boundary condition:
u(t) - interpolated via cubic spine from measurements by Traykovski
                                          written by Houshuo Jiang on August 17, 2006
***************************************************************************************/

#include "udf.h"

DEFINE_PROFILE(unsteady_flow, thread, position)
{

  /* ttt[]: sampled times */
  /* u[]: sampled streamwise flow velocity */
  /* d2_u_dt2[]: calculated 2nd time derivative of u */
  /* start time =    0.12499359 , end time = 602.12499000 */

  static real ttt[4817]=
  {
0.00000000E+00, 0.12499430E+00, 0.24999865E+00, 0.37499294E+00, 0.49999729E+00,
0.62500164E+00, 0.74999593E+00, 0.87500029E+00, 0.99999461E+00, 0.11249989E+01,
0.12500033E+01, 0.13749976E+01, 0.14999919E+01, 0.16249962E+01, 0.17500006E+01,
0.18749949E+01, 0.19999992E+01, 0.21249935E+01, 0.22499978E+01,
};
static real u[4817]=
  {
0.29486706E+00, 0.25832370E+00, 0.22072441E+00, 0.18439429E+00, 0.14780788E+00,
0.11332307E+00, 0.80134080E-01, 0.49663854E-01, 0.21209121E-01,-0.60646123E-02,
-0.28923945E-01,-0.49841599E-01,-0.66707764E-01,-0.79936611E-01,-0.88913036E-01,
0.26710739E+00, 0.27723406E+00, 0.28560768E+00, 0.29210729E+00, 0.29621414E+00,
0.29912153E+00, 0.30260917E+00
  };

  static real d2_u_dt2[4817]=
  {
0.85972525E-01,-0.17194505E+00, 0.19746624E+00,-0.13169408E+00, 0.23201899E+00,
0.10576336E-01, 0.22222984E+00, 0.14550020E+00,-0.31192043E-01, 0.43361966E+00,
-0.82670364E-02, 0.34437811E+00, 0.18666827E+00, 0.30615838E+00, 0.22151801E+00,
0.29484003E+00, 0.38174390E+00, 0.11195380E+00, 0.17885390E+00, 0.26852023E+00,
0.21346864E+00, 0.30599166E-01, 0.10479063E+00, 0.10472997E+00,-0.22994860E-01,
0.16925363E-01,-0.11893041E+00,-0.12963144E+00,-0.57996749E-01,-0.38344444E-01,
-0.23898451E+00,-0.79638780E-01,-0.11563157E+00,-0.17745479E+00,-0.93369114E-01,
0.90338604E-01,-0.45169302E-01
  };

  int n=4817;

  /* variables for the cubic spline algorithm */
  int klo,khi,k;
  real h,a,b;

  /* variables for printing out messages */

  /* variables for the FLUENT UDF settings */
  face_t ft;
  real t, xvelocity;
  t = CURRENT_TIME;

  /* By means of bisection to locate the right place for t in the table */
  klo=1;
  khi=n;
  while (khi-klo > 1)
  {
   k=(khi+klo) >> 1;
   if (ttt[k-1] > t) khi=k;
   else klo=k;
  }
  /* klo and khi now bracket the input value of t. */

  /* Transfer from unit-offset to zero-offset. */
  klo=klo-1;
  khi=khi-1;

  h=ttt[khi]-ttt[klo];
  a=(ttt[khi]-t)/h;
  b=(t-ttt[klo])/h;

  /* Cubic spline polynomial is now evaluated to obtain the velocity at time t. */
  xvelocity = a*u[klo]+b*u[khi]+((a*a*a-a)*d2_u_dt2[klo]+(b*b*b-b)*d2_u_dt2[khi])*(h*h)/6.0;

  Message("current time = %15.8e s, u = %15.8e m/s\n", t, xvelocity);  /* \n denotes a new line */

  begin_f_loop(ft, thread)
  {
F_PROFILE(ft, thread, position) = xvelocity;
  }
  end_f_loop(ft, thread)
}

/*****************************************************************
UDF for volume-integrating k and epsilon, for calculating the total
volume, and for writing them into a file.

Exporting U,W at a cell about 50cm above the ripple crest to a
file.
                  written by Houshuo Jiang on August 25, 2006.
******************************************************************/

DEFINE_ON_DEMAND(tke_epsilon_pointuw)
{
real sum_tke=0.0, sum_epsilon=0.0, sum_volume=0.0;
real flowtime, xx[ND_ND];
real x0_ripple=-0.39102757, x1_ripple=0.37087719;  /* define the two sides of the ripple interested */
real cellx0=0.0450395, cellx1=0.05541;          /* define the streamwise bound of the cell */
real cellz0=-0.2933, cellz1=-0.2639;             /* define the vertical bound of the cell */
real cellu=0.0,cellw=0.0,cellcentroidx=0.0,cellcentroidz=0.0;

Domain *d;  /* declare domain pointer since it is not passed as an argument to the DEFINE macro */
Thread *t;
cell_t c;

FILE *fp1, *fp2;

d = Get_Domain(1);  /* returns fluid domain pointer */

flowtime = CURRENT_TIME;

/* Integrate TKE, epsilon, and export the cell variables */
thread_loop_c(t,d)
{
   begin_c_loop(c,t)
      C_CENTROID(xx,c,t)
      if ((xx[0]>x0_ripple) && (xx[0]<x1_ripple))
      {
         sum_tke += C_K(c,t)*C_VOLUME(c,t);
         sum_epsilon += C_MU_EFF(c,t)/C_R(c,t)*C_STRAIN_RATE_MAG(c,t)*C_STRAIN_RATE_MAG(c,t)*C_VOLUME(c,t);
         sum_volume += C_VOLUME(c,t);
      }

      if ( ( (xx[0]>cellx0) && (xx[0]<cellx1) ) && ( (xx[1]>cellz0) && (xx[1]<cellz1) ) )
      {
         cellu = C_U(c,t);
         cellw = C_V(c,t);
         cellcentroidx = xx[0];
         cellcentroidz = xx[1];
      }
   end_c_loop(c,t)
}

fp1 = fopen("TKE_epsilon_vs_t.dat","a"

; /* open a file named TKE_epsilon_vs_t.dat in append mode and assign it to fp1 */
fprintf(fp1,"%15.8e %15.8e %15.8e %15.8e\n", flowtime,sum_volume,sum_tke,sum_epsilon);
fclose(fp1);

fp2 = fopen("pointUW_vs_t.dat","a"

; /* open a file named pointUW_vs_t.dat in append mode and assign it to fp2 */
fprintf(fp2,"%15.8e %15.8e %15.8e %15.8e %15.8e\n", flowtime,cellu,cellw,cellcentroidx,cellcentroidz);
fclose(fp2);

Message(" Success!"

;
}