DATA SET 3: BASIC REAL PARAMETERS

Free-field format input contains 10 real numbers as follows:

  1. DELT = Initial time-step size (T).
  2. CHNG = Percent change in the time-step size in each of the subsequent time increments, (dimensionless in decimal fraction).
  3. DELMAX = Maximum allowable time-step size (T).
  4. TMAX = Maximum simulation time (T).
  5. W = Time-derivative weighting factor for all terms except the velocity terms:

0.5 = Crank-Nicholson central.

1.0 = Backward difference and mid-difference.

  1. WV = Time integration factor for the velocity terms:

0.0 = Forward difference (explicit).

0.5 = Central difference.

1.0 = Backward difference (completely implicit).

  1. OME = Relaxation parameter for solving the nonlinear equation:

0.0 - 1.0 = Under-relaxation.

1.0 = Exact relaxation.

1.0 - 2.0 = Over-relaxation.

  1. OMI = Relaxation parameter for pointwise iterative solution of the matrix equation:

0.0 - 1.0 = Under-relaxation.

1.0 = Exact relaxation.

1.0-2.0 = Over-relaxation.

  1. TOLA = Error tolerance for solving the nonlinear equations. Half of its value is used as the tolerance for solving the linearized matrix equation with pointwise iteration.
  2. APHAG = Upstream weighting factor if IOPTIM = 0: Values are between 0.0 and 1.5 when the advection form of the equation is used. If APHAG > 1.34, the program will choose appropriate values of weighting factor. When the conservative form of the equations is used or when IOPTIM = 1, this value is not used by the program.

v1.0 - 1/14/1999

Jin-Ping Gwo, email: jgwo@umbc.edu