# Time step calculation

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 March 1, 2006, 04:24 Time step calculation #1 Shashi Guest   Posts: n/a Dear all How can we calculate the time stem for a case involving both convection, diffusion buoyancy and combustion. Thank you

 March 1, 2006, 08:27 Re: Time step calculation #2 al Guest   Posts: n/a 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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