Hello Fluent users: I have been trying to solve a case study in fluent involving moving walls but was not successful. Every time when i try to repeat the examples in the manual, i get the following error message after a few iterations.

"Negative cell volume detected"

Any thoughts to overcome this would be very helpful.

Hi, Try to reduce your time step!

Skd

What are the sutible B.C for intake air flow through engines

fuel injection directly into chamber at 40 degree BTDC. which moel is for this problem

What are the sutible B.C for intake air flow through engines .(open inlet valve)

Hi guy,

I've got exactly the same problem than you. In fact you need to input a dynamic mesh. I wonder if we don't need any grid interfaces in more, I will let you know if I succeed.