CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Large global courant number and small residuals

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 19, 2020, 17:31
Default Large global courant number and small residuals
New Member
Join Date: Jun 2020
Posts: 1
Rep Power: 0
PotatocatIL is on a distinguished road
Hi all,

I'm simulating transient two-phase flow (liquid-vapor) in a cylinder-shape separator. This is a try-run with Eulerian-eulerian model + Multi-Fluid VOF model+ Implicit Fomulation+ Sharp type interface modeling because I'm trying to get both the flow path of droplets and the separation of two phases. Also, for the viscous model, I used realizable k-e +standard wall functions and calculate the turbulence per phase. (I know it's a lot of calculation...)

The thing is: when I use the adaptive time step and set the global courant number= 400 (The default setting is 800). It seems I have a really small time step (1e-5 s) while the residuals are all small (1e-10 to 1e-4). Is this normal? Can I further increase the global courant number?

Thank you in advance!
PotatocatIL is offline   Reply With Quote


two-phase flow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
courant number increases to rather large values 6863523 OpenFOAM Running, Solving & CFD 22 July 5, 2023 23:48
[Other] Can't Shake Erros: patch type 'patch' not constraint type 'empty' BrendaEM OpenFOAM Meshing & Mesh Conversion 12 April 3, 2022 18:32
AMI speed performance danny123 OpenFOAM 21 October 24, 2020 04:13
Inconsistencies in reading .dat file during run time in new injection model Scram_1 OpenFOAM 0 March 23, 2018 22:29
pisoFoam with k-epsilon turb blows up - Some questions Heroic OpenFOAM Running, Solving & CFD 26 December 17, 2012 03:34

All times are GMT -4. The time now is 18:05.