mk value inquiry for main/01_dam_break tutorial

usercfd · March 2022

hello,

The dam break tutorial places an MK=20 mode for a set of particles in the upstream face of the solid obstacle in the middle of the tank. I could not find any reference to mk=20 in the Def.xml file. Seems it is something to do with force or pressure calculation on that face but not sure which file is relevant that generates that mk=20 tag,

Can you please explain?

Asalih3d · March 2022

There is a difference between mkbound and mk. Mkbound is the identifier for boundary object, let us say it has a value of 10. Then "mk" which is general id, will most commonly be equal to 20, since mk = 10 + mkbound.

The reason for "10" is that the first 10 mk values (0 to 9) are held for fluid particles. So mk = mkfluid, is the short explanation.

Does it make sense?

So in your Case_def.xml, mkbound = 20, would be post-procssed using post-processing tools as mk = 30, since mk = 10 + mkbound = 10+20 = 30.

Kind regards

usercfd · March 2022

thanks for the note.

Alex · March 2022

More information in page 145 of XML_GUIDE_v5.0.pdf (in \DualSPHysics_v5.0\doc\guides)

Regards

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mk value inquiry for main/01_dam_break tutorial

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