CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Time Step Problem in NS equations code

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 18, 2013, 21:12
Default Time Step Problem in NS equations code
  #1
New Member
 
Join Date: Nov 2012
Posts: 1
Rep Power: 0
eulerian is on a distinguished road
Hi everyone,

This is my first post in this site.
I am trying to simulate compressible(supersonic) flow laminar boundary layer on a flat plate as given in CFD JD Anderson last chapter problem except that i am solving through Finite Volume Method rather than FDM used in the book.
I am using Van Leer Flux Splitting for Inviscid flux discretisation,
Central differencing for gradient calculation and euler explicit scheme for time integration.I have considered isothermal wall on the bottom.

1. Now the problem is I am using dimensional equations and Re no. is found out to be more than 10^7. But it should be less than 5*10^5 for laminar flow on flat plate. I am able to generate a boundary layer though. Help me with this!!!!
2. Time step dt is found to be zero in every iteration and i am able to generate boundary layer. How is this even possible. Even if i increase the accuracy of time step it's still showing zero. CFL no. used is 0.2 and I have used Sutherland's law for updating viscosity. Pls help how to overcome this problem.

Thank You.
eulerian is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Low Mixing time Problem Mavier CFX 5 April 29, 2013 01:00
Problem with FloatingObject Leech OpenFOAM Running, Solving & CFD 10 March 29, 2012 16:24
directMapped problem panda60 OpenFOAM Bugs 4 July 8, 2010 11:23
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 02:29
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 03:58


All times are GMT -4. The time now is 03:48.