Does anyone has experience of CFD analysis with sliding grids? I would like to know what are the possiblities of this technique and with which commercial codes ? I also need to understand how we can control the motion of the grid and how it is linked to unsteady flow computation. Thanks

Dear sir,

I have calculated the flow in the intake port and cylinder of engineering with moving valve and piston. The code named KIVA-3,in this code you can calculate the slid mesh using the new method called "snapper". wang haigang 2/17, 2000

Fluent 5 has the capability of simulate sliding mesh, example like turbine machine is a typical application. You may want to look into the Fluent forum, there is a thread talking about sliding mesh I think.

I have used CFX4 with sliding grids quite successfully to study rotating stall in a centrifugal pump. The simulation was quite qualitative, but typical parameters such as stall propagation velocity was very well predicted. If you want some more details, I can send you info about it.

Regards

Mesh sliding means that you have relative movement between neighbouring blocks such as staor/rotor interaction or valve movement in Internal Combustion Engine, thus the flow is normally transient- if you are familiar with unstructured mesh methodology, then this simply means that at the interface, the cell connectivities changes dynamically. For a structured mesh, you can alternative use shear-click type of sliding mesh. I believe all three commercial codes listed in the Forum have this capability.

Hi, I have used Flo++ for the modelling of a projectile as it moved past the muscle break (in other words a very fast piston leaving the flow domain).

I think Flo++ uses an arbitrary face coupling at the sliding interface.