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Avalanche Blaster CFD Analysis NEED HELP (Multiple Compressible Fluids Interacting with The Open Atmosphere)

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bselent
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Avalanche Blaster CFD Analysis NEED HELP (Multiple Compressible Fluids Interacting with The Open Atmosphere)

Hey All,

 

I am currently working on improving upon a very interesting Avalanche Blaster design that I have stumbled upon, but I am struggling to lock down all boundary and initial conditions. The design consists of two fluid accumulator tanks, two pipe flow networks, and one impinger that mix pressurized O2 and propane followed by an ignition spark. When the impinger is held over unstable snow and an explosion occurs, an avalanche is formed. Any help in properly setting up the simulation is greatly appreciated. Below you can find further technical descriptions, questions and file attachments that should provide an entire picture of the problems I am having.

 

Question 1: Is Autodesk Ultimate CFD strong enough to run CFD simulations for multiple compressible fluids that meet and mix in an environment open to the atmosphere? (If no, that halts all current progress on this software).

 

Technical Description: The tanks, pipe network, and impinger are all made of steel. The atmospheric conditions can be estimated as so: Temp (20F or 266.48K), Pressure (67kpa or 9.71 psi), Wind Speed (0 mph). Two accumulator tanks (not in a vacuum state) of the same volume (15,256 in3) receive different pressurized gasses. Tank 1 is supplied with propane until the gauge pressure of the tank reads 10psig. Tank 2 is supplied with 02 until the tank pressure reads 50psig. Once both tanks are at their desired pressures, the nitrogen powered valves open extremely quickly dumping both fluids through the pipe network into the impinger. After a certain delay, a spark goes off in the impinger, igniting the explosive mixture. What I really want to understand is how are these gasses mixing and is to much escaping to the open environment before a spark occurs. 

 

Description: Currently, I am at the conclusion that a Free Surface Analysis simulation will be required as multiple fluids (3) are at play. Out of Characters will share more if any interest is shown!

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bselent
in reply to: bselent

I have a lot more drawings, and files that can be shared. I attempted to attach my cfd file as well, but Autodesk Forums said it wasn't allowed (.cfz file). Like I said if anyone shows interest I will be super helpful and provide everything I have to work towards a solution. Thanks!

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