Setting mass of boundary when using computeforces

musm

How do you set the density of the boundary when computing the forces on the object?

For example looking at CaseDambreak:
we have
`%computeforces% -dirin %dirout% -filexml %dirout%/%name%.xml -onlymk:21 -savecsv %dirout%/WallForce `

Where is the density of the wall defined?

Alex

The density of the boundary, the mass of the boundary is computed in GenCase:
- all boundary particles start with reference density (value defined in the XML)
- mass is computed as density*dp*dp*dp and the value is shown in the output XML file

ComputeForces only use that information that was computed before as initial state for the simulation.

Regards

musm

Thanks, in the XML guide it states
"3) We do the summation of ACCELERATION values of those boundary particles"
just to be clear this involves the density of the fluid particles?

Alex

density? fluid partices?

when you compute FORCE exerted onto, for example, a wall:
- solve momentum equation dv/dt(acceleration) for the BOUNDARY particles of that wall interacting with surrounding particles (with fluid of course)
- then we do a summation of those acceleration values multiplied by the mass of each boundary particle

Regards