Time step calculation
Dear all How can we calculate the time stem for a case involving both convection, diffusion buoyancy and combustion. Thank you

Re: Time step calculation
Physically, determining the dominant process, for example,
convection > delta_t approx delta_x / Vel diffusion > delta_t approx delta_x deltaX / (2 diffCoef.) ... and so on, the smallest delta_t is which your need to use. Mathematically, you can use stability analysis, e.g, Matrix method or Von Neumann's, but it much more difficult depending on the problem. 
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