DWSIM Development Blog

Build 3676 fixes a lot of bugs and adds important features to DWSIM. What's new:

- Napthali-Sandholm Simultaneous Correction (SC) method for rigorous column solving

- New Flowsheet color scheme, improved connector drawing algorithm, faster object drawing

- Expression support for the Sensitivity Analysis Utility

- Support for performance & system curves in the Adiabatic Pump

Click here to go to the downloads section.

I just implemented the pump curves feature in DWSIM. You'll be able to input head, power, efficiency, required NPSH pump curves and also build system curves using the sensitivity analysis utility, which was enhanced to support expressions as dependent variables.

The input values won't be limited to the simulation's unit set. Each curve has its own units and you'll be able to display the curves in the units you want to.

I'm planning to release the build with the new features and numerous bug fixes within the next days.

The next build will come with a number of bug fixes and improvements, with the most important being a series of optimizations in the rigorous colum model. You'll have more specification options, a new solving method (Naphtali and Sandholm Simultaneous Correction) and more control of the convergence process through new properties. Russell's IO method and the new one are now using four-point numerical derivatives. This scheme is a little slower than the usual 2-point differentiation, but greatly enhances the stability and reliability of the algorithm.

Drawing of the flowsheet is now much, much faster. I removed the antialiasing setting from the OnPaint method, but the quality remains the same.