Abstract
Discussion of an adaptive-implicit method (AIM) for thermal simulation that provides different degrees of implicitness in various gridblocks. A special treatment of flow terms during appearance or disappearance of any particular phase is critical. This treatment creates a more stable Jacobian matrix. The switching between implicit and explicit treatment is automatic and problem independant; it is superior to classical threshold switching. Results from the simulation of several thermal recovery processes are presented. The saving in computer time over a fully implicit method ranges from 34 to 62%.
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