Two Distinct Dynamic Mesh Zones Representing One Body

Shrap · October 27, 2021, 09:42

Hi fellow CFD enthusiasts,

I'm analysing a conical poppet relief valve using dynamic mesh in fluent 2021 R2.

Previously I used a single named selection for the whole poppet to extract the force acting on the poppet.
However I'm now interested in extracting the force only on the conical part of the poppet. I therefore created a separate named selection called "cone" and a second one representing the remaining surfaces of the poppet called "restpoppet".

Having two different named selections forces me to create two different dynamic mesh zones coupled to the same 1DOF UDF.
My concern is, that in doing so, the two dynamic mesh zones may move independently from each other depending on the hydrodynamic forces acting on them (although they are parts of the same rigid body).

Or, will the two dynamic mesh zones move together as a rigid body, since the "type" of dynamic mesh zones is "rigid body" for both named selections and that they are linked to the same Six DOF UDF?

Any help is appreciated!

https://ibb.co/pj47Ghr

Best Regards,
Shrap

Shrap · December 7, 2021, 09:09

After some testing, it turns out the two dynamic meshes move together when they are connected to the same 1DOF UDF

October 27, 2021, 09:42	Two Distinct Dynamic Mesh Zones Representing One Body	#1
Shrap New Member Anon Join Date: Jul 2017 Posts: 9 Rep Power: 8	Hi fellow CFD enthusiasts, I'm analysing a conical poppet relief valve using dynamic mesh in fluent 2021 R2. Previously I used a single named selection for the whole poppet to extract the force acting on the poppet. However I'm now interested in extracting the force only on the conical part of the poppet. I therefore created a separate named selection called "cone" and a second one representing the remaining surfaces of the poppet called "restpoppet". Having two different named selections forces me to create two different dynamic mesh zones coupled to the same 1DOF UDF. My concern is, that in doing so, the two dynamic mesh zones may move independently from each other depending on the hydrodynamic forces acting on them (although they are parts of the same rigid body). Or, will the two dynamic mesh zones move together as a rigid body, since the "type" of dynamic mesh zones is "rigid body" for both named selections and that they are linked to the same Six DOF UDF? Any help is appreciated! https://ibb.co/pj47Ghr Best Regards, Shrap

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Dynamic Mesh Problem.	Tom Clark	FLUENT	10	June 21, 2021 04:27
[snappyHexMesh] dynamic mesh: rotating body with increasing/decreasing distance to fixed body	mo_na	OpenFOAM Meshing & Mesh Conversion	3	July 26, 2016 04:51
Local mesh refinement definition in a DEFORMING dynamic mesh zone using Dynamic Mesh	Emanuele88	FLUENT	0	February 9, 2016 11:39
Dynamic Mesh Modeling - Six Degree Rigid Body Motion	bluewings	OpenFOAM Running, Solving & CFD	0	February 12, 2013 20:08
dynamic mesh for rotating body	Sumit	FLUENT	0	September 14, 2008 06:07

December 7, 2021, 09:09		#2
Shrap New Member Anon Join Date: Jul 2017 Posts: 9 Rep Power: 8	After some testing, it turns out the two dynamic meshes move together when they are connected to the same 1DOF UDF