... Fluid Dynamics software, the function of the CFD is to simulate the experiment on the computer.And by ... Howden, UK, and the blade of the impeller is back-warded streight, with front-coned disk.Nowadays, by ... . The 6-39-B No.10D module fan is developed with the NUMATIC FINE/Turbo software package, ... of BB50 module, the alternated form of the impeller is back curved, and from the test report, the module ...