# Riemann Invariants

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 June 20, 2008, 10:29 Riemann Invariants #1 Tush Guest   Posts: n/a Can some one please give me insight about the Riemann Invariants in 2D Inviscid flows...???Any literature will be welcome. Also I need to know the 4 formulae, if possible in non-dim. form.Explain if possible.Thank u in adv... Tushar, IIT Guwhatai, India.

 June 20, 2008, 12:11 Re: Riemann Invariants #2 Patrick Guest   Posts: n/a The Riemann invariants are defined only for one-dimensional flows, in two-dimensional flows they are called the Charactersitics of the flow and are the analogs to the 1D Riemann invariants. The Riemann invariants are really about what and how is propagated through the flow? Any information can propagates in the flow at 3 different velocities. If v is the velocity of the fluid, c is the sound velocity there, then any information can propagates at the speeds: v v+c v-c these are the characteristics speeds of the propagation of the information. What propagates are called (Riemann) invariants and so you have in the present case 3 of them. say R1, R2 and R3. In a subsonic regime v

 June 21, 2008, 12:11 Re: Riemann Invariants #3 Tushar Guest   Posts: n/a Thank you so much...

 July 7, 2009, 13:49 #4 Member   Nishant Kumar Join Date: Jun 2009 Posts: 32 Rep Power: 15 Hey Patrick, Do you know from where I can get the code for 1D Riemann compressible flows? Thanks