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unsteady state calculation with adaptive time step

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Old   November 7, 2007, 01:26
Default unsteady state calculation with adaptive time step
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I have been using coupled solver for unsteady state calculation with adaptive time step. I find that the time step becomes very small (1x10e-08 seconds) and so it takes unusually long time to compute. Is there way to achieve convergence with a larger step size. Is linearization of the source term possible. Also can we fix the lower limit of the scalar variables i.e say it should always be positive. sm
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