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kkeonho / IBAMR

An adaptive and distributed-memory parallel implementation of the immersed boundary (IB) method
http://ibamr.github.io/
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[blood-clot]: Fix hourglass instability #1

Open labdala opened 2 years ago

labdala commented 2 years ago

switching from the non-local deformation gradient tensor to a stabilized version of it: https://github.com/kkeonho/IBAMR/blob/kkeonho/immersed-peridynamics/src/IB/IBPDForceGen.cpp#L913-L1044

labdala commented 2 years ago

The approach for this is to increase the order of the approximation of the gradient deformation gradient. Currently we have a second order approximation. Chowdhury et al propose a correction function that is of order n+3 (eq 9). Then the non-local gradient deformation tensor is expressed in eq 15.

labdala commented 1 year ago

Goal is to try to reduce HourGlass instability by implementing the bond-associated deformation gradient tensor.

References: https://inldigitallibrary.inl.gov/sites/sti/sti/Sort_5673.pdf https://sci-hub.hkvisa.net/10.1016/j.mechrescom.2018.04.004

Try to reproduce the trend of figure 7 second paper for soft material. See if we improve hour hourglass instability