notes on convergence/ model troubleshooting:

05/08/2019

test 1: 
only cartilage contacts, no meniscus or ligament contacts included 
first time step converged at time 0.025, I interrupted the run, as results are not meaningful. just wanted to make sure there were no issues in any cartilage ties/contacts 

test 2:
inlcude the lateral meniscus to femoral + tibial cartilage contacts 
first time step converged at time 0.0125. Interrupted the run 

test 3:
include the medial meniscus to femoral + tibial cartilage contacts 
ran for 18 hours, got to 72 percent, I interrupted the run
- the femur jumped over the medial meniscus and it buckled towards the end of the run. we will see if adding QAT contact helps balance this. 

05/09/2019

test 4:
include QAT to FMB/FMC contact , MCL to MNS tie , and MCL to FMB,TBB contacts. 
seg faulted. 
tried each of these one at a time:
only mcl-mns tie - runs 
only QAT to FMB - seg fault 
only QAT to FMC - seg fault
only MCL to FMB - seg fault
only MCL to TBB - seg fault

Checked med files again in salome, there was no overlap between tie and contact surfaces... but I removed some areas of the contact surface surrounding the tie surface on the edges... maybe those are causing problems? 

re-ran MedToFebio.py with updated QAT and MCL med files. 
test 1 - no QAT or MCL ties - runs
test 2 - only QAT to FMB - seg fault
test 3 - only MCL to FMB - seg fault 

Ahmet figured out that if we change the contact type to "sliding node on facet" instead of "sliding elastic" it doesnt seg fault. Also seems as though this is dependent on the Febio version used. 

changed the QAT and MCL contacts to sliding node on facet. It runs to 48.6% in 5h:36min, then fails to converge.  we will leave it for now. Looks like there is element locking in the top of the lcl where it is tied to the FMB.