Non reflecting boundary condition
I wanna define nonreflecting boundary condition for numerical simulation on wall. I know we can absorb wave with porous wall but i wanna define a boundary condition which absorb shock wave without mass diffusion. Do you have any experience about it? could you please help me about it. I try some numerical method such as characteristic method, .. but when i defined it,it reflect shock waves.
I've studied the articles by K.W. Thompson: Time dependent boundary conditions for hyperbolic systems I & II but this kind of boundry condtion define just for outlet or inlet i wanna to denfine it (( on wall )). I Know about sponge layer but this kind of boundary condition need some space to decrease amplitude of wave but i wanna define a wall which doesnt have any diffusion of mass. thanks 
Re: Non reflecting boundary condition
You can use the ghost points boundary condition of Dong and Tam for cartesian coordinates or the ghost point BC of Hixon ( AIAA) for curvilinear coordinates. Both the BC has been defined to implement high order wall boundary conditions required to prevent the contamination of the solution in Computational Aeroacoustics when highorder finite difference schemes are employed. Also you can look for the papers by Kim et. al from UK for implementation of characteristic boundary conditions with inclusion of non linear terms and the paper by Poinsot and Lele (1992, JCP) for the same but including only linear terms.
Harish PS: I do not have the papers. Search wall boundary condition or boundary conditions for compressible flows in google scholar to find the exact paper names. 
non reflecting boundary condition in a wave tank
Hi saeid
i wanna define nonreflecting boundary condition for numerical simulation a wave tank but i do not know how i can do it, could you please help me about this, all the best elahe 
Hi saeid
i forgot that say about the software i work by it. it is fluent. did you work with it until now? thank you in advance elahe 
Hello all,
Has any one come up with a resolution for nonreflecting boundary condition? Preferably I need to know how to impose a numerical beach in the domain. Regards. Henry. 

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fluent nonreflecting boundary condition 
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Sorry that it's not what you're looking for (nor did you originally state what you were looking for), but it's what the link would have given you if it was working. 
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