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How to make Porosity to be strain dependent in poroelastic model ?

Posted 2011年8月17日 GMT-4 07:41 Porous Media Flow, Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 4.2 0 Replies

Krishna Manda
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Hi,

I, beginner to COMSOL, modeled a biphasic soft tissue using poroelastic model in COMSOL as fully saturated porous medium is, mathematically, identical to biphasic medium, i.e., all the pores are filled with fluid. Hence porosity is equal to the ratio of volume of the fluid to the total volume. The solid deformation becomes quasi static due to coupling term (time rate of change of evol) between time-dependent Darcy law and solid mechanics module.

When the volumetric changes occur in the model, the porosity must change accordingly. But in COMSOL poroelastic model, the variable porosity seems to be constant through out analysis.

Porosity seems appear only in storage coefficient but not inside any differential term. Porosity in current configuration should be equal to volume of fluid in current configuration to total volume in reference configuration.

How could i input this into model ?? Would anyone has any idea ?? I am sure this is already implemented in Abaqus, but i am wondering how to do it in COMSOL ?

I desperately need to model porosity as vol. strain dependent as permeability in soft tissue is porosity/strain dependent.

Thank you in advance !

/Krishna
0 Replies Last Post 2011年8月17日 GMT-4 07:41
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Hello Krishna Manda

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