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Updating the flux var cache is very expensive for mpfa schemes. We thus introduce a new update() method in the elementfluxvarcaches. Instead of binding again, the localjacobian calls this method. In the tpfa case this forwards directly to bind when parameters are solution dependent as we know we only store the darcy transmissibilities as the others are by default solution dependent and are calculated on the fly. For mpfa, the fluxvarcachefiller decides what to update (in case of compositional flow only the diffusive transmissibilities will be updated when the permeability is not solution dependent).
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