guidelines for dynamicMesh for piston motion

Zena27 · May 8, 2023, 07:41

Hello guys,
I need to simulate the motion of a piston that has the motion shown in the figure below.

pistonDrawing.PNG
so basically the piston doesn't press on the whole fluid region, there are liquid surrounding the piston.

In this problem, I know that I need mesh motion + topology changes (sliding interface and layer addition/removal). I saw many videos and many posts on this forum but I am still confused.

My questions are:
1. Is there a dynamic mesh library that can work with this problem directly? (I tried

Code:

solidBodyMotion

but it doesn't compress the liquid because it deals with it as a solid. Also, I tried

Code:

dispalcementLayeredMotion

but It doesn't know how to deal with sliding interface.)

2. If there is not a direct library to use? what libraries shall I combine their features? and I want some guidelines in this process.

Thank you so much.

2538sukham · February 4, 2024, 08:24

Why don't you try linearValveLayersFvMesh from foamExtend. They do have that feature of attach-detach, sliding and layer addition removal. Note: These library compiles only in foamExtend.

May 8, 2023, 07:41	guidelines for dynamicMesh for piston motion	#1
Zena27 Member Zeinab Join Date: Feb 2023 Posts: 30 Rep Power: 3	Hello guys, I need to simulate the motion of a piston that has the motion shown in the figure below. pistonDrawing.PNG so basically the piston doesn't press on the whole fluid region, there are liquid surrounding the piston. In this problem, I know that I need mesh motion + topology changes (sliding interface and layer addition/removal). I saw many videos and many posts on this forum but I am still confused. My questions are: 1. Is there a dynamic mesh library that can work with this problem directly? (I tried Code: solidBodyMotion but it doesn't compress the liquid because it deals with it as a solid. Also, I tried Code: dispalcementLayeredMotion but It doesn't know how to deal with sliding interface.) 2. If there is not a direct library to use? what libraries shall I combine their features? and I want some guidelines in this process. Thank you so much.

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February 4, 2024, 08:24		#2
2538sukham Member Michael Sukham Join Date: Mar 2020 Location: India Posts: 79 Rep Power: 6	Why don't you try linearValveLayersFvMesh from foamExtend. They do have that feature of attach-detach, sliding and layer addition removal. Note: These library compiles only in foamExtend.