hello to all of you,

i am a young engineer who loves his job(analysis engineer) but i have to many problems..... and noone helps me...

i try to create a simulation of a 3d pump (like a propeller) to see hoe the water get in the input and export from the output...i want to make it with moving mesh , i create the cad in solidworks nad then mesh the water in cfx mesh, only the water.. now

how can i put the surfaces of the impeller to move???? i try to see every tutorial but no one help me !!!

shall i choose the surfaces and make the a boudary or what???

please help me !!!!!! please save me !!!!!

Is it a cutting waterjet or propulsion waterjet? if you agree, I am willing to help you analysis it by CFX or Fluent.

it is a propulsion jet, can you tell me to put a sliding mesh on some surfaces???

best regards

Make two meshes. One staionary mesh. One rotating mesh. Create an interface (just a cilinder) in between

In Pre make two domains (stat and rot). Create a sliding GGI on the interface. First use frozen rotor. Secondly use transtient rotor stator interactions, if you have a stator.

Gert-Jan

Gert

i have not a stator, shall i create the impeller and the water and mesh them and in pre just create two meshes one for the water and other for the impeller?? and then create an interfeace betwen and put GGI?? is that what you mean?

hayate

You have to create a cylindrical shape mesh in which your impeller in included (rotating domain). And one mesh with the rest of the geometry (stationary domain). Create three GGI's for the three surfaces of the cylinder. Do not put them in a single GGI. This won't work.

Good luck, Gert-Jan

www.bunova.nl

GERT

YOU TELLING ME THAT I SHOULD MESH THE WATER WITHOUT THE IMPELLER AND THE SHIP BUT FIRST TO CREATE TWO PARTS ONE THE WATER THAT ROTATES WITH THE IMPELLER AND THE OTHER THE OTHER WATER AND MAKE TWO INTERFEACES ON BETWEEN THE ONE SIDE OF THE WATER STATIONARY) AND THE WATER (IMPELLER ) AND AFTER THAT TO RUN THE ANALYSIS... TELL ME SOMETHING TO THE OPTIONS OF THE INTERFACE WHAT SHALL I PUT???? IN FRAME MODEL AND THE OTHER INTREFEACE PARAMETERS???.

I THANKS YOU A LOT. HAYATE

as I said, you need three interfaces for top-top, bottom-bottom and circumferential-circumferential surfaces. Use a fluid-fluid interface with GGI, automatic, frozen rotor. The exact options depend on your problem setup. Hard to tell..... Just give it a try.

Gert-Jan

a sliding mesh can be applied in the interface between rotor outlet and stator inlet.

hello

i create the simulation as gert tell me , but this options is to apply rotational frames , i want to create a sliding mesh..... is there any tutorial for that??? have you got any example??

thanks to all of you for your help.