# who know the software NaSt3DGP

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 July 14, 2005, 07:36 who know the software NaSt3DGP #1 ztdep Guest   Posts: n/a i meet some problem when i study this software,if someonge if familiar with it ,may i make a communicatin with you ! regards. thank you very much

 July 14, 2005, 13:37 Re: who know the software NaSt3DGP #2 Junseok Kim Guest   Posts: n/a I am using that software from time to time. What is your question?

 July 15, 2005, 05:40 Re: who know the software NaSt3DGP #3 ztdep Guest   Posts: n/a i have give you a email . thank you very much for your feedback!

 July 21, 2005, 07:38 Re: who know the software NaSt3DGP #4 ztdep Guest   Posts: n/a how can we perform a steady computation with the NaSt3DGP thank you for your feedback

 July 21, 2005, 12:04 Re: who know the software NaSt3DGP #5 Junseok Kim Guest   Posts: n/a You run a long time evolution until the solution doesn't evolve. Then you will get a steady computation if it has a steady solution.

 July 22, 2005, 01:59 Re: who know the software NaSt3DGP #6 ztdep Guest   Posts: n/a thank you very much ! but i saw the time step changed automatically ,how can i set a time step that doennot change . regards

 July 22, 2005, 02:15 Re: who know the software NaSt3DGP #7 Junseok Kim Guest   Posts: n/a check the file named as navcalc.cxx in the src direction. //####################### //## Time-Step Control ## //####################### NS_REAL NavierCalc::TimeStep() { int i,j,k,l,oldtimer=timer->Start(6,Par) ; NS_REAL deltneu=S.deltmax ; static NS_REAL xmin=1e15,ymin=1e15,zmin=1e15 ; if (xmin==1e15 && ymin==1e15 && zmin==1e15) { PIJKLOOP {xmin=min(xmin,DX[i]); ymin=min(ymin,DY[j]); zmin=min(zmin,DZ[k]);} } // local CFL-condition including volume forces PIJKLOOP { deltneu=min(deltneu, S.tfconv*2/(fabs(U[i][j][k])/DXM[i]+ sqrt( (U[i][j][k]*U[i][j][k])/(DXM[i]*DXM[i])+4*fabs(S.g[0])/(S.froude*DXM[i])) +1E-15)); deltneu=min(deltneu, S.tfconv*2/(fabs(V[i][j][k])/DYM[j]+ sqrt( (V[i][j][k]*V[i][j][k])/(DYM[j]*DYM[j])+4*fabs(S.g[1])/(S.froude*DYM[j])) +1E-15)); deltneu=min(deltneu, S.tfconv*2/(fabs(W[i][j][k])/DZM[k]+ sqrt( (W[i][j][k]*W[i][j][k])/(DZM[k]*DZM[k])+4*fabs(S.g[2])/(S.froude*DZM[k])) +1E-15)); } // Viscosity deltneu=min(deltneu,S.tfdiff*S.re*0.5/(1./(xmin*xmin)+1./(ymin*ymin)+1./(zmin*zmin))); if(deltneu<1E-15) { printf("Maybe ERROR in parameters: Time-Step = 0.0 ! \n");exit(1); } if(S.TimeDis==1) { // Compute new time step (8 steps smoothing through parabola for AB) deltneu=(S.timesteps<9)?((1-((S.timesteps+1)*0.1-1)*((S.timesteps+1)*0.1-1))*deltneu):deltneu; } timer->Stop(oldtimer,Par); return deltneu; }

 July 26, 2005, 14:44 Re: who know the software NaSt3DGP #8 ami_cfd Guest   Posts: n/a Hi all, The NaSt3DGP is a multiblock or single block solver? thanks

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