Alsvinn  0.5.3
The fast FVM simulator with UQ support
LaxFriedrichs.hpp
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1 /* Copyright (c) 2018 ETH Zurich, Kjetil Olsen Lye
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15 
16 #pragma once
17 #include <string>
18 #include "alsfvm/types.hpp"
19 
20 namespace alsfvm {
21 namespace numflux {
22 
23 
24 
27 template<class Equation>
29 public:
33  static const std::string name;
34 
35  template<int direction>
36  __device__ __host__ inline static real computeFlux(const Equation& eq,
37  const typename Equation::AllVariables& left,
38  const typename Equation::AllVariables& right,
39  typename Equation::ConservedVariables& F) {
40  static_assert(sizeof(Equation) == 0, "Lax-Friedrich flux not implemented");
41  //F = 0.5*(eq.f(Ul,d) + o.f(Ur,d)) - 0.5*(dx/dt).*(Ur-Ul);;
42 
43  // This looks a bit weird, but it is OK. The basic principle is that AllVariables
44  // is both a conservedVariable and an extra variable, hence we need to pass
45  // it twice since this function expects both.
46  return fmax(eq.template computeWaveSpeed<direction>(left, left),
47  eq.template computeWaveSpeed<direction>(right, right));
48  }
49 };
50 } // namespace alsfvm
51 } // namespace numflux
Definition: LaxFriedrichs.hpp:28
#define __host__
Definition: types.hpp:46
double real
Definition: types.hpp:65
static const std::string name
name is "laxfriedrichs"
Definition: LaxFriedrichs.hpp:33
__device__ static __host__ real computeFlux(const Equation &eq, const typename Equation::AllVariables &left, const typename Equation::AllVariables &right, typename Equation::ConservedVariables &F)
Definition: LaxFriedrichs.hpp:36
#define static_assert(x, y)
Definition: types.hpp:52
#define __device__
Definition: types.hpp:45
Various utility functions to implement the tecno flux.
Definition: types.hpp:30