Dynamic mesh
 

Hi, all.

I have here such mesh. Help, please, how to set UDF for rotation of gears?

Hi Tapoky

I dont know about UDF, but I can recommend you, to use MRF for an steady problem, or to use an Sliding mesh for a transient problem, for more information about this, you can see the fluent user's guide.

Moving Reference Frame would be indeed perfect for this rather than using dynamic mesh with UDF. If you have the fluent tutorials, there's actually a tutorial for a very similar case, you should check it out. It's called sliding Mesh.

Maybe it's good idea, but what about end faces? It's linkage of gears. How I can separate this face by zones in these places?

I think mrf cannot be applied because you can't create surfaces of revolution to include the gears without intersecting them. I think the only way is to assign a moving boundary to the gears' walls and set up remeshing. I think there is on ansys support a tutorial for a gear pump, just search for it.

Thx, I think so. But I don't know how to change udf file of this tutorial for using in 3D mission.

i am allan, have you finished your simulation? and my job is about a helical gear pump, of course 3 dimesion, udf shoud not be the problem when simulating gear pump using CFD software, but the mesh re_meshing. my email is 619313616@qq.com, and i hope we'll have some common things to talk about, and you can join the qq group 337969380 (i built it for that reason)