Reimann problems
Dear Friends,
I have two queries. 1. When a 1D reimann problem is cast as 2D, making the vvelocity component zero, and the problem involves a single shock, Quirk reports the oddeven decoupling problem, leading to numerical disturbances behind the shock. Is this observed for a single rarefaction wave also ? In other words, do genuinely nonlinear fields experience this problem when cast in 2D? 2. I have seen several computations of Reimann problems, but not with Roe Reimann solver. Is it that the 2D problem, is four initial 1D reiamnn problems and decoupling issues with Reimann solvers prevent their usage ? Thanks in advance Regards, Ganesh 
Re: Reimann problems
Actually I have a question for you.
How can I move from 1D Riemann problem to 2D. In other words, where to start in order to move to 2D and 3D. As I understand it there is no 2D or 3D Riemann problem and the problem am still a beginner. Thanks. 
Re: Reimann problems *NM*

Re: Reimann problems
Dear Brian,
The easiest way is to take a 1D problem, and consider it in a 2D domain, with the same states as in 1D, with the vvelocity component zero. There are otherwise 2D reimann problems, where analogous to 1D where left and right states are defined, initial states are defined on four quadrants. 26 such cases exist and a good review of these using central schemes can be found in the paper of Kurganov&Tadmor, among others. Hope this helps. Regards, Ganesh 
Re: Reimann problems
is it reimann or riemann?

Ganesh,
Did you solve the riemann problem for 1 D? Are you dealing with compressible flow? Were you able to figure it out? Reply me at babuu.nishu@gmail.com Thanks 
All times are GMT 4. The time now is 11:40. 