Time Step sizing
 

Understand the sizing of time step, as per manuals. Typical Cell Size /characteristic velocity...

But if I was to simulate a flow condition over 48 hours, is it wrong to divide the 48 hours over for an example 10 steps. Time step = 48/10 (then convert to seconds).

This will give me a flow simulation over 24 hours.

Please let me know what you think

thanks

Are you asking a question? I don't know what you want from us...

To be or not to be, that is the question.. (Shakespear)
 

Yes my friend I am asking a question. "Is it wrong to divide ... "

But let me refraze.

I am monitoring a solution in Fluent over 48 hours, heat transfer analysis.

I have selected 10 time steps, with each step size of 17,280 seconds.

Where 17,280 seconds = 4.8 hours. Will later then plot a graph of temperature against every time step (or every 17,280 seconds).

Is this the correct way in analyzing over 48 hours transient model?

eg
transient;
time step = 17,280s
No of time steps 10
Iterations 20 per a time step.

This could be a correct way.

It could be that 10 time steps is not sufficient and you need more, or that the 20 iterations per time step is not sufficient, but that really depends on your problem.

Experimenting
 

Previous inputs did not work.

Got divergence at AMG ....

Now trying a different approach, will share the outcome, if it works.
Using PISO, PRESTO, .., Turbulence k-w sst..


Thanks.