Minimum Resolved Time Step

Minimum Resolved Time Step = <float>

Description / Usage

Its role is to set a lower bound for the time step with respect to the Time step error tolerance. When a converged time step is obtained by GOMA, the difference between the predicted solution and final solution for that time step is compared to the Time step error tolerance. If the difference exceeds this tolerance the step fails and the time step is cut (usually by a factor of 2), UNLESS the time step falls below the Minimum Resolved Time Step size. In this case the step is accepted, even if this error tolerance is not achieved. This provides a mechanism for the modeler to control what phenomena is resolved and what phenomena is ignored.

<float>

Any floating point number in the same units as specified in the delta_t card.

Examples

A sample card that sets the maximum time step to 10.0 follows:

Maximum Resolved Time Step = 10.0

Technical Discussion

See GT-034 for a thorough discussion.

References

GT-034: Tutorial on time step parameter selection for level-set problems in GOMA. April 1, 2006. D. R. Noble