|June 24, 2009, 03:33||
how to calculate CFL number in 3D convection-diffusion channel flow
Join Date: May 2009
Posts: 3Rep Power: 9
1. 3D channel flow , equation is
df/dt + c df/dx = nu*d^2f/dx^2
unsteady channel flow
2. spacial discretization is second CDS, time discretization is implicit Euler.
3. in x,y,z direction, length of FVM is dx,dy,dz respectively,
how to calculate CFL number in 3D case?
in peric's book , it was mentioned :
dt < 1/(2*nu/dx**2 + c/dx)
but it was 1D case, in channel flow, x direction is convective dorminated,
while in y direction(normal to wall), grid is fine, diffusion may be important.
welcome any reply
|Thread||Thread Starter||Forum||Replies||Last Post|
|Turbulence model for low Reynolds number flow?||Nokadu||Main CFD Forum||3||May 26, 2013 11:42|
|heat conduction in solid and convection in flow||kunal||FLUENT||3||February 29, 2012 05:42|
|CFL number specification sonic/supersonic flow||gr||Main CFD Forum||0||January 16, 2009 12:14|
|pressure outlet (open channel flow)||Willem Brantegem||FLUENT||2||April 4, 2007 02:40|
|compressible channel flow..||R.D.Prabhu||Main CFD Forum||0||July 17, 1998 17:23|