CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   Time step size in VOF implicit (

flow_CH July 28, 2013 01:50

Time step size in VOF implicit
I am new user in CFD.
I am modeling in VOF multiphase. In vof panel with activating the implicit, the courant number is deactive.
In this case, how can i define Time step size?

Jim87 July 28, 2013 16:00

There is an universal equation in the users guide. In order to calculate your iteration to the timestep.

In my eyes you could test 3 cases (like 0,1 sec; 0,01 and 0,001). The residuals should give a first hint, if a time step size fits or not.

A general answer for your case isn't that easy. Maybe test 3 step sizes?

Here a discussion (maybe helpfull):

All times are GMT -4. The time now is 01:45.