You might find University of South Carolina 's VTB (Virtual Test Bench) software useful. It is free to download (but seems to be closed source -- I couldn't find any details on the license). [1]http://vtb.engr.sc.edu/vtbwebsite/#/Overview It's intended for doing multidisciplinary simulations involving fluid flow, electronics, logic, microcontrollers and so on, with different solvers being used for different types of components in the simulation. You can add your own solver, or write your own device primitives using existing solvers. It includes components representing pumps, valves, digital logic, motors, space vector modulation algorithms, vehicles, math functions, etc. The interface is quite nice to use, too. As for the gschem / spice route - It occurs to me that if you want to simulate hydraulic systems, you'll have to keep track of both pressure and temperature of the fluid in the lines. If each hydraulic line is represented by a single line in gschem, the netlister should convert it into two different nets in the spice simulation - one for pressure and one for temperature in that line. Also, take a good look at gnucap; it also has the flexibility of adding your own device primitives, which could be very useful for fluid systems. I haven't tried it, but a simple primitive of the form "pressure drop = 0.5 * Cv * flow^2" is probably much easier to implement in gnucap than in spice. __________________________________________________________________
Looking for the perfect gift?[2] Give the gift of Flickr! References 1. http://vtb.engr.sc.edu/vtbwebsite/#/Overview 2. http://www.flickr.com/gift/
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