I am a Master Thesis student in Aerospace Engineering of the University of Bologna and I am working on an FSI problem involving the sliding contact between two thin deformable plates with zero clearance, made of steel and fixed on one end, under the action of mineral oil.
Since large deformations are expected, I am making use of the explicit dynamic solver in CalculiX coupled with pimpleFoam after multiple failed trials with implicit solvers. The coupling scheme I’m currently using is parallel implicit with IMVJ. I found that rbf-compact-tps-c2 and thin-plate-splines mapping lead to diverge of the force while nearest-neighbor mapping does not. Nearest-neighbor mapping however leads to unphysical solutions (ref. fig). In addition, there is a singularity in the pressure distribution.
To avoid sub-cycling I used as coupling time step of 1E-9s as dictated by CFL requirements by CalculiX. Contact is implemented as contact pair, type surface to surface (face to face penalty contact). The surface behaviour is set to linear pressure-overclosure with slope equal to 50 times the Young’s modulus as a first guess, and frictionless.
I would like to enquire if there are any known issues with the use of the explicit algorithm in CalculiX with preCICE or even the use of contact. I would greatly appreciate any help/advice from the community.
Thanks in advance!
preciceconfig.xml (2.9 KB)