*********** delta_t *********** :: delta_t = ----------------------- Description / Usage ----------------------- This card is required for **transient** simulations to set the value of the initial time step. The input parameter is defined as: Any floating point number that indicates the time step in the appropriate units for your problem. To specify a fixed time step size for an analysis, set to be a negative number, e.g. -1.0e-6; the code will use a constant (positive) time step. Should convergence problems occur when a fixed step size is specified, the size of the time increment entered for the *delta_t* card will be reduced by half until convergence is achieved. Once a constant time step is reduced, it will not be increased. ------------ Examples ------------ Following is a sample card for an initial time step: :: delta_t = 6.e-03 If a constant time step is desired, use a negative value: :: delta_t = -6.e-03