Mesh for Cylinder-Piston?
 

I try to simulate a flow in a cylinder gap of 0.2 mm(!) with a piston jump stroke of up to 30 mm. Has any body experiences in succeeding in this kind of example? Also what should be prefered ?Mesh layer addition& removal or squeezing the layers of the mesh as the piston approaches the cylinder bottom. As I heard STAR-CD allows to add/remove cells in mesh motion... are there any other CFD packages supporting this feature?

Thanks and regards from a new begginner..

Re: Mesh for Cylinder-Piston?
 

Hi, I'm using CFX-TASCflow to simulate an IC engine. The code squeezes/expands the cells as the piston moves. All I can say that works but it is extremely hard to control the moving nodes and I didn't find a way to close completely the gap between the valves and the cylinder piston because I can't have elements of null volume. Thus, I believe the addition/removal cells feature is the best approach for this case. Like you I know that Star-CD does this feature. What about KIVA?

Regards, cfd guy

Re: Mesh for Cylinder-Piston?
 

Hi all

KIVA definitely can do this being created for the primary purpose of simulating in-cylinder flows.

A number of example grids can be found on their site.

HTH

Re: Mesh for Cylinder-Piston?
 

Have a look at FOAM (www.nabla.co.uk). It is free for academic use.