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-   -   slope limiter of discontinuous Galerkin on triangular element(2D, P2 polynomial) (https://www.cfd-online.com/Forums/main/96240-slope-limiter-discontinuous-galerkin-triangular-element-2d-p2-polynomial.html)

 effort8 January 17, 2012 04:02

slope limiter of DG method

Hello, friends!!
These days I'm studying discontinuous Galerkin method.
And I'm computing 2D Burgers equation for test problem.

I have to use slope limiter due to spurious oscillations.
The slope limiter of P1 polynomial was explained well in Cockburn & Shu paper.
(The Runge-Kutta discontinuous Galerkin method for conservation laws V)

For the P2 case, the solutions are defined at the three mid-point of edges and the three vertices on triangular element.
TVB limiter is just considered at the three mid-point of edges.
Thus, we can compute the limited solution at the three mid-point of edges (It is easy.).
But we have to consider the solutoin at the three vertices for the P2 case.

How to obtain limited solution at the three vertices on triangular element?

I would appreciate it if anyone give me some comments.

Thanks!!

 zqb0929 March 19, 2012 10:03

i think the slope limiter should be applied to limit the the linear part of the numerical solutions(no matter how high order polynomials) and higher parts remain unchanged. we should limit the three values of mid-point of three sides which are computed from the linear part of the numerical solutions.maybe i am wrong.:)

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