Learning Forum

[graihan]

Dear Altruits, I wanted to define dynamic mesh with Six Dof in solid and interface between solid and fluid. I wanted rotate solid with a constant speed and interface of solid and fluid. Do can I define interface motion if I want that interface rotate as same speed with solid. Do you I have to define shallow wall as well? Thank you so much!

[Rob]

What's actually moving? If the motion is fixed and linear (or rotational) such that you're not changing the mesh (cell) shape sliding mesh may also be suitable. 

[graihan]

Hello Rob, 

Thanks for your reply. I wanted to rotate solid body and interface between solid and fluid with the same rotational speed. When I setup the interface, I get one interface and one shadow interface. if I want to rotate interface do I have to rorate the shadow interface as well? How can I define the interface rotating as the same speed as solid body? DO I have to use relative motion with speed "0" to assign as interface is rotating with solid body? Thanks in advance !

[Rob]

The interface is to allow fluid to pass, if you have a wall & shadow pair it's not an interface. You then set motion on the fluid zone(s). 

[graihan]

Hello Rob, 

Thank you so much for your reply. I actually wanted to rotate the solid body and fluid body with the same rotational speed. Therefore, I created mesh interface in the solid-fluid wall that shares the same boundary. I considered following dynamic zones: tool:rigid with 6DOF, Fluid domain: deforming, interface 1: relative motion with respect to tool 0 and interface 2: relative motion with respect to tool 0. Would you please let me know if my dynamic mesh defination is correct? Thank you so much. 

[Rob]

Which pair are you talking about? If the two cylinders rotate at the same speed I'd use a conformal mesh.