Supersonic flow simulation for multi-component

February 3, 2005, 05:49

Hi, All

I am simulating H2 jet, injecting into air. The relatvie pressure at the H2 inlet is 20 Bar, and the inflow velocity uses the sonic speed of H2 (About 1300m/s).

I found out when dealing with multi-component flows, the supersonic option for the inlet condition is no longer available! It means I can't specify the inlet velocity and the pressure at the same time! Though someone suggested I should use the total energy option for heat transfer, that is the way I always do. Problems are still not solved. Anyone any ideas?

Thanks in advance

Jianping

February 9, 2005, 02:34

Hi, Jianping,

I had exactly the same problem than you. Solution is simple. Use CFX 5.7.1 instead of CFX5.7 and supersonic option at the inlet is also availabe if you use a multicomponent fluid.

Andi

February 9, 2005, 04:34

Thanks Andi,

Yes, I think that is a bug in CFX 5.7.

It can be overcome by using 5.7.1 or manually modifying the CCL. The CFX team replied me, and it works fine!

February 3, 2005, 05:49	Supersonic flow simulation for multi-component	#1
Jianping Guest Posts: n/a	Hi, All I am simulating H2 jet, injecting into air. The relatvie pressure at the H2 inlet is 20 Bar, and the inflow velocity uses the sonic speed of H2 (About 1300m/s). I found out when dealing with multi-component flows, the supersonic option for the inlet condition is no longer available! It means I can't specify the inlet velocity and the pressure at the same time! Though someone suggested I should use the total energy option for heat transfer, that is the way I always do. Problems are still not solved. Anyone any ideas? Thanks in advance Jianping

February 9, 2005, 02:34	Re: Supersonic flow simulation for multi-component	#2
Andreas Krause Guest Posts: n/a	Hi, Jianping, I had exactly the same problem than you. Solution is simple. Use CFX 5.7.1 instead of CFX5.7 and supersonic option at the inlet is also availabe if you use a multicomponent fluid. Andi

February 9, 2005, 04:34	Re: Supersonic flow simulation for multi-component	#3
Jianping Guest Posts: n/a	Thanks Andi, Yes, I think that is a bug in CFX 5.7. It can be overcome by using 5.7.1 or manually modifying the CCL. The CFX team replied me, and it works fine!

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