Immersed boundary solver & smooth VOF initialization in OpenFOAM

Taozi · March 19, 2020, 10:11

Hi Community, I want to share my immersed boundary solver "sdfibm" (https://github.com/ChenguangZhang/sdfibm), I will omit the technical details (in paper) and show you what it can do. See the included example of the sedimentation of 100 particles (video version at https://www.youtube.com/watch?v=C6U9X9zatz8).

The code only depends on OpenFOAM, and is trivial to install and use---both as research and teaching tools, please please star the repository if you find it useful ^ ^

It also contains a tool to smoothly---which also means accurately---initialize VOF phase fractions in OpenFOAM, which works with arbitrary polyhedron meshes. See example initializations:

The tool is under the tool_vof folder, with the above example included.

Why smooth field: because simply setting fraction to 0-1 (as by setFields in OpenFOAM) gives a staircase or zig-zag interface. The resultant capillary waves are annoying and pollute the simulation. See comparison below (left my tool, right setFields)

frantov · August 30, 2021, 20:27

Thanks for sharing!

Im interested in this amazing piece of code.

Im looking forward how this evolve and if you need any help in testing any future additions, let me know.

I have not been able to generate internal corners using planes.

I have tried implementing the collision rectangle-sphere or circle but my code crashes once circle touches rectangle (no bouncing).

cheers
F

March 19, 2020, 10:11	Immersed boundary solver & smooth VOF initialization in OpenFOAM	#1
Taozi New Member Chenguang Zhang Join Date: Jul 2012 Location: Baton Rouge Louisiana Posts: 15 Rep Power: 14	Hi Community, I want to share my immersed boundary solver "sdfibm" (https://github.com/ChenguangZhang/sdfibm), I will omit the technical details (in paper) and show you what it can do. See the included example of the sedimentation of 100 particles (video version at https://www.youtube.com/watch?v=C6U9X9zatz8). The code only depends on OpenFOAM, and is trivial to install and use---both as research and teaching tools, please please star the repository if you find it useful ^ ^ It also contains a tool to smoothly---which also means accurately---initialize VOF phase fractions in OpenFOAM, which works with arbitrary polyhedron meshes. See example initializations: The tool is under the tool_vof folder, with the above example included. Why smooth field: because simply setting fraction to 0-1 (as by setFields in OpenFOAM) gives a staircase or zig-zag interface. The resultant capillary waves are annoying and pollute the simulation. See comparison below (left my tool, right setFields) snak, elvis, francescomarra and 3 others like this.

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August 30, 2021, 20:27		#2
frantov Member Francisco T Join Date: Nov 2011 Location: Melbourne, Australia Posts: 64 Blog Entries: 1 Rep Power: 14	Thanks for sharing! Im interested in this amazing piece of code. Im looking forward how this evolve and if you need any help in testing any future additions, let me know. I have not been able to generate internal corners using planes. I have tried implementing the collision rectangle-sphere or circle but my code crashes once circle touches rectangle (no bouncing). cheers F