trnsystor.statement.DFQ¶
-
class
trnsystor.statement.
DFQ
(k=1)[source]¶ DFQ Statement.
The optional DFQ card allows the user to select one of three algorithms built into TRNSYS to numerically solve differential equations (see Manual 08-Programmer’s Guide for additional information about solution of differential equations).
Initialize the Differential Equation Solving Method Statement.
- Parameters
k (int, optional) – an integer between 1 and 3. If a DFQ card is not present in the TRNSYS input file, DFQ 1 is assumed.
Note
The three numerical integration algorithms are:
Modified-Euler method (a 2nd order Runge-Kutta method)
Non-self-starting Heun’s method (a 2nd order Predictor-Corrector method)
Fourth-order Adams method (a 4th order Predictor-Corrector method)