[saeed jamshidi]

Hello,

I have a question regarding performance of openfoam and fluent in simulating of fluid flow. Why these tools give us different time scales?!
For instance, consider laminar flow over a cylinder at Re=100; simulation reaches to the consistency after 200 seconds by openfoam, whereas it is 20 seconds for the same case by fluent!

Regards

[Tobermory]

... because you set the simulations up differently. They are both solving the same physics.

[saeed jamshidi]

Tobermory، thank for the reply.
Your response doesn't deliver any information on to me😅
Would you like to go a little bit in details?!

[Tobermory]

Haha - well, to be fair, you didn't supply any details either! And also

1. what do you mean by "reaches to the consistency"
2. are the times you quote simulation times or wall-clock times?

There are then countless questions that follow on: what numerical schemes did you employ? are the boundary conditions and mesh identical? steady state or transient? if transient, are the time steps the same? etc etc etc.

For us to help, you need to narrow down your question.

[saeed jamshidi]

Yeap, you are right 👍.
All of the conditions are similar, numerical scheme, solver and it is transient problem. Actually, a simple case, laminar 2D flow past a cylinder with the same mesh.

I'v just noticed about significant difference between time scale in openfoam and fluent.

Best