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By Jochen Schütze, MixSim Product Manager With the release of MixSim 2.0, the numerical simulation of fluid flow in stirred tanks will enter a new era. The revised user interface allows for quick setup of mixing equipment using a parts tree, where objects can easily be added, modified, and deleted. Several brand name impellers and a variety of generic impeller types are available. The flexible library file format allows for the addition of any kind of impeller, and other tank internals as well. CAD files of impellers can also be read by MixSim and incorporated into a vessel with other MixSim-specified internals.
A mixing tank, created by MixSim 2, contains three impellers and four baffles; in addition to velocity vectors, velocity contours are shown on the impellers and on surfaces near the middle and lower impellers; pressure contours are shown on the baffles; and iso-surfaces of helicity are shown behind the top impeller bladesAfter the mixing vessel - which can include multiple arbitrarily positioned shafts, baffles, and various top and bottom shapes - is completely specified, MixSim automatically creates the geometry and mesh in GAMBIT, sets up a FLUENT 6 case file, and performs the calculation, automatically displaying appropriate convergence monitors. New, intelligent postprocessing functions provide informative process parameters and easy-tounderstand graphical presentation of the results. As an added bonus, the MixSim-generated files can be read into the stand-alone products GAMBIT and FLUENT, or they can be read back into MixSim for further modifications. During a MixSim session, the MixSim console can be converted to the full FLUENT console with a simple mouse click. This allows adjustments or extensions to be made to the model definition. Finally, repetitive tasks can be coded using FLUENT journal files, which can be executed through the graphical user interface. In short, the new MixSim goes a long way towards making the simulation of complex mixing tanks much easier. |
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