Doubt in "density" & "Elasticity Modulus" used in Cardiac Simulation

[Dipankul Bhattacharya]

Dear all,
Greetings of the day.

The values that are defined under "density" & "Elasticity modulus" in the Guccione-active example in ustruct, are they some normalized values or actual values in some unit system? I didn't understand the comment "used for computing tauM/tauC".

Also can you please explain why these values are different in the "struct formulation" of example related to cardiac mechanics in documentation of simCardio ?

Looking forward to your kind support.

Warm Regards
Dipankul

[Jijo Derick Abraham]

Dear Dipankul,

tauM and tauC denote the stabilisation parameters in the Variable Multiscale method (VMS) formulation used in the ustruct module.
Elastic modulus is used to calculate mu and c which is further used to calculate tauM and tauC.
Whereas the struct module doesn't need this.

Brief detail about the formulation is given on the website https://simvascular.github.io/docsSimCa ... ics-theory
A small screenshot of the same I am attaching here.
.
The subroutine for the calculation of the stabilisation parameters in the code can be found at svFSI/Code/Surce/svFSI/MATMODELS.f (line 1095 to 1125)

Also for further details regarding the VMS formulation, you can refer to the following paper.
https://doi.org/10.1016/j.cma.2018.03.045

Hope this is useful,
Cheers
Jijo
Note: I am not a simvascular forum moderator, I am just another svFSI user.