Dear DuMux developer, Looking at the fluidmatrixinteractionlaws, I do find the implementation of several partial derivatives. For example, in case of the BrooksCorey model:
* The derivative of the relative permeability for the non-wetting phase in regard to the wetting saturation dkrn_dswe() * The derivative of the relative permeability for the wetting phase with regard to the wetting saturation dkrw_dswe() * The partial derivative of the capillary pressure w.r.t. the effective saturation dpc_dswe() * The partial derivative of the effective saturation w.r.t. the capillary pressure dswe_dpc() I don't really understand the purpose of the derivatives. In case I remove them, my code is still running fine and is given me the identical result. However, since I am currently implementing a modified fluidmatrixinteractionlaw, I would like to understand the purpose of the derivatives. Unfortunately, in this case, the DuMux Handbook as well as the online documentation provides quite limited information. Best regards, Felix -------------------------------- Felix Feldmann Research Assistant [cid:[email protected]] SAN Campus P O Box 2533, Petroleum Institute Abu Dhabi, UAE M +971 565624402 [email protected]<mailto:[email protected]>
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