# Bow Shock Capturing

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 April 16, 2013, 11:01 Bow Shock Capturing #1 New Member   Ronak Gupta Join Date: Apr 2013 Posts: 5 Rep Power: 5 Hi, I have run a code for computation of inviscid supersonic flow around cylinder using a finite volume approach. The bow shock is very much in the final mach number plot. Can someone please tell me if a finite volume method has shock capturing ability implicitly in it or is there something I am missing? The computation is done using a forward time stepping procedure for inviscid Euler equation. Ronak

 April 19, 2013, 10:08 #2 Member     Serge A. Suchkov Join Date: Oct 2011 Location: Moscow, Russia Posts: 74 Blog Entries: 5 Rep Power: 6 Which shock-capturing method are you used ? PS: Take a look http://en.wikipedia.org/wiki/Shock_capturing_method __________________ OpenHyperFLOW2D Project

 April 19, 2013, 12:02 shock capturing #3 New Member   Ronak Gupta Join Date: Apr 2013 Posts: 5 Rep Power: 5 I have a used a simple finite volume discretization with forward step for time integration. Euler equations have been used in their conserved state. My question is does the above said finite volume discretization have the ability to capture shock. I read in a paper that a finite volume discretization in conserved state captures shock as a weak solution.,Is that the reason?

April 19, 2013, 13:29
#4
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Filippo Maria Denaro
Join Date: Jul 2010
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Quote:
 Originally Posted by Ronak Gupta Hi, I have run a code for computation of inviscid supersonic flow around cylinder using a finite volume approach. The bow shock is very much in the final mach number plot. Can someone please tell me if a finite volume method has shock capturing ability implicitly in it or is there something I am missing? The computation is done using a forward time stepping procedure for inviscid Euler equation. Ronak
Discretizations of the Euler equation with FV are compatible with singularity when derived from the integral form of the equations.
But the "capture" of a physically admissable shock is not ensured by FV if the entropy condition is not verified, too. Monotone scheme ensures the pysical capturing but you need to work with several formulations (TVD, ENO/WENO)

 April 19, 2013, 19:03 #5 New Member   Ronak Gupta Join Date: Apr 2013 Posts: 5 Rep Power: 5 U(1, = U(1, - dtA.*R(1,; U is the Euler vector. Above is the forward step for time integration. R is flux calculated across various edges of the traingular grid. There is no other term added during the process. Will the above method capture shock.? The output has the bow shock clearly visible .

April 20, 2013, 04:02
#6
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Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,518
Rep Power: 31
Quote:
 Originally Posted by Ronak Gupta U(1, = U(1, - dtA.*R(1,; U is the Euler vector. Above is the forward step for time integration. R is flux calculated across various edges of the traingular grid. There is no other term added during the process. Will the above method capture shock.? The output has the bow shock clearly visible .
This instruction says nothing ... the key is in the type of flux reconstruction used in R

 April 22, 2013, 02:51 #7 New Member   Ronak Gupta Join Date: Apr 2013 Posts: 5 Rep Power: 5 The Euler flux evaluation is evaluated specifically as an HLLE flux function. Brief lookup told me that HLLE flux construction is a type of Riemann solver. Can an HLLE flux construction be used for capturing shock in gas dynamics problems?

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