How check mass conservation
 

Dear all OpenFOAM users,

I need your help to check mass conservation in HronTurekFsi case which is located in
foam-extend-3.0/tutorials/solidMechanics/icoFsiElasticNonLinULSolidFoam

how can I check mass conservation there. What is the procedure?
Any one tried or have any idea about the procedure, his/her answer would be welcomed.

Regards