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

Question about residual in S-A model

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   February 25, 2016, 20:01
Question Question about residual in S-A model
  #1
New Member
 
Hanxun Yao
Join Date: Feb 2016
Posts: 5
Rep Power: 3
Hanseny is on a distinguished road
Hi,

I am recently validating my S-A turbulence model by using a plat plate case, but odd thing happened when I was running higher order spatial scheme (2th and 5th order) of inviscid term. The residual was oscillating around 1e-1 and did not converged at all.

In order to exclude the mesh problem, I redid a very simple mesh with just a viscous wall beside without round leading edge, while same thing happened.

Afterwards, to let the case simper, I repeated my simulation with just inviscid solver, unfortunately, still diverged, which confused me a lot.

Could someone please give a suggestion? what would causes the problem? really appreciated your help.

PS: my case run as below:

initial condition:
mach number =0.2 (since compressible solver)
inlet velocity =5.4 (m/s)
inflow turbulent eddy viscosity_tilde =3.0e-5/1.2
density =1.2
temperature,pressure and energy initiated as routine method.

numerical method:
5th order spatial discretization for inviscid flux
2th order spatial discretization for viscous and diffusive flux
2th order time discretization (RK SSPRK method)
CFL number 0.1 (been decreased from 0.5 when running high order scheme)
Hanseny is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
High Courant Number @ icoFoam Artex85 OpenFOAM Running, Solving & CFD 11 February 16, 2017 14:40
settlingFoam unstable? bendel_boy OpenFOAM Running, Solving & CFD 38 July 8, 2016 05:07
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Why RNGkepsilon model gives floating error shipman OpenFOAM Running, Solving & CFD 3 September 7, 2013 08:00
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03


All times are GMT -4. The time now is 23:06.