For fluid particle interations, specially sedimentation problems, when I am using the direct forcing immersed boundary method, the calculation of the torque is not exactly accurate. I have read in papers that for IBM, the effective radius is slightly smaller than the physical radius and hence the placement of the lagrangian nodes shoould be slightly lesser (by about 0.5dx) than the physical radius. What is the basis for this and can someone please refer to e some solid literature?
Would you mind to give the title of the paper you mentioned "the effective radius is slightly smaller than the physical radius"?
Junhua Pan
Effect of internal mass in the simulation of a moving body by the immersed boundary method
I think the problem depends on which kind of IBM you used. For a direct forcing IBM, a surface mesh (immersed surface) with triangle represents a solid surface. Then hydrodynamic force exerting on the immersed surface is calculated. So the the physical radius is the real radius.
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