Changes in Wanda 4.0 July 2011
The following changes have been made since the first release of Wanda 4.0 vs. May 2011:
- Bug fix in the pressure calculation in the H-node. An H-node with more than 1 connected PIPE (with different diameters) showed the incorrect minimum pressure. The Wanda 4 manual has been updated with a clear definition of the pressure in the H-node (Section 4.4). An erratum of the manual pages 4 - is available from the wiki http://wanda.deltares.nl.
- Improved numerical stability of Tee, Y and cross junction components.
- Improved messages and error handling of steady state computation. If the steady state solution is not converged after the specified number of maximum iterations, the steady message report is displayed automatically. An error message has been added and the debug information with the 20 last solution vectors has been removed.
- The handling of an unstable solution (a solution with changing behaviour of an H-component, the so called reciprocating phase change) is improved. The user gets an error message when an unstable steady state solution is found.
- For both errors (Converging and Stability) it is allowed to start the unsteady simulation. The model may converge further during the unsteady simulation (do not specify any action for a couple of time steps).