[Commits] [svn:einsteintoolkit] GRHydro_InitData/trunk/src/ (Rev. 201)

[rhaas at tapir.caltech.edu]

User: rhaas
Date: 2013/03/27 08:48 PM

Modified:
 /trunk/src/
  GRHydro_BondiM.c

Log:
 GRHydro_Init_Data: compute w_lorentz from uT and alp instead of vel
 
 later on prim2con will of course compute the grid function using vel
 
 From: Roland Haas <rhaas at tapir.caltech.edu>

File Changes:

Directory: /trunk/src/
======================

File [modified]: GRHydro_BondiM.c
Delta lines: +4 -12
===================================================================
--- trunk/src/GRHydro_BondiM.c	2013-03-28 01:48:57 UTC (rev 200)
+++ trunk/src/GRHydro_BondiM.c	2013-03-28 01:48:59 UTC (rev 201)
@@ -1225,21 +1225,13 @@
     vely(i) = (ucon[YY]/ucon[TT] + betay[i]) * inv_alp;
     velz(i) = (ucon[ZZ]/ucon[TT] + betaz[i]) * inv_alp;
 
-    w_lorentz[i] = 1./sqrt(1-(gxx[i]*SQR(velx(i))+gyy[i]*SQR(vely(i))+gzz[i]*SQR(velz(i))+
-                              2*(gxy[i]*velx(i)*vely(i)+gxz[i]*velx(i)*velz(i)+gyz[i]*vely(i)*velz(i))) );
-    if(isnan(w_lorentz[i])) {
-      CCTK_VWarn(CCTK_WARN_ALERT, __LINE__, __FILE__, CCTK_THORNSTRING,
-                 "nan in w_lorentz at (%g,%g,%g): v2 = %g",
-                 x[i],y[i],z[i],(gxx[i]*SQR(velx(i))+gyy[i]*SQR(vely(i))+gzz[i]*SQR(velz(i))+
-                              2*(gxy[i]*velx(i)*vely(i)+gxz[i]*velx(i)*velz(i)+gyz[i]*vely(i)*velz(i))));
-    }
-
     SpatialDet(gxx[i],gxy[i],gxz[i],gyy[i],gyz[i],gzz[i],&det);
 
     if(bvec_method == BVEC_TRANSFORM) {
-      Bvecx(i) = w_lorentz[i]*bcon[XX] - alp[i]*bcon[TT]*ucon[XX];
-      Bvecy(i) = w_lorentz[i]*bcon[YY] - alp[i]*bcon[TT]*ucon[YY];
-      Bvecz(i) = w_lorentz[i]*bcon[ZZ] - alp[i]*bcon[TT]*ucon[ZZ];
+      const CCTK_REAL w = ucon[TT] * alp[i];
+      Bvecx(i) = w*bcon[XX] - alp[i]*bcon[TT]*ucon[XX];
+      Bvecy(i) = w*bcon[YY] - alp[i]*bcon[TT]*ucon[YY];
+      Bvecz(i) = w*bcon[ZZ] - alp[i]*bcon[TT]*ucon[ZZ];
     } else {
       Bvecx(i) = bondi_bmag*SQR(M)*x[i]/sqrt(det)/CUBE(r[i]);
       Bvecy(i) = bondi_bmag*SQR(M)*y[i]/sqrt(det)/CUBE(r[i]);