1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
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26 Foam::limitedCubicLimiter
29 Class with limiter function which returns the limiter for the
30 TVD limited centred-cubic differencing scheme based on r obtained from
31 the LimiterFunc class.
33 Used in conjunction with the template class LimitedScheme.
38 \*---------------------------------------------------------------------------*/
40 #ifndef limitedCubic_H
41 #define limitedCubic_H
45 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
50 /*---------------------------------------------------------------------------*\
51 Class limitedCubicLimiter Declaration
52 \*---------------------------------------------------------------------------*/
54 template<class LimiterFunc>
55 class limitedCubicLimiter
64 limitedCubicLimiter(Istream& is)
70 FatalIOErrorIn("limitedCubicLimiter(Istream& is)", is)
71 << "coefficient = " << k_
72 << " should be >= 0 and <= 1"
73 << exit(FatalIOError);
76 // Avoid the /0 when k_ = 0
77 twoByk_ = 2.0/max(k_, SMALL);
82 const scalar cdWeight,
83 const scalar faceFlux,
84 const typename LimiterFunc::phiType& phiP,
85 const typename LimiterFunc::phiType& phiN,
86 const typename LimiterFunc::gradPhiType& gradcP,
87 const typename LimiterFunc::gradPhiType& gradcN,
91 scalar twor = twoByk_*LimiterFunc::r
93 faceFlux, phiP, phiN, gradcP, gradcN, d
107 // Calculate the face value using cubic interpolation
109 cdWeight*(phiP - 0.25*(d & gradcN))
110 + (1 - cdWeight)*(phiN + 0.25*(d & gradcP));
112 scalar phiCD = cdWeight*phiP + (1 - cdWeight)*phiN;
114 // Calculate the effective limiter for the cubic interpolation
115 scalar cubicLimiter = (phif - phiU)/stabilise(phiCD - phiU, SMALL);
123 return max(min(cubicLimiter, 2), 0);
126 // Limit the limiter to obey the TVD constraint
127 return max(min(min(twor, cubicLimiter), 2), 0);
132 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
134 } // End namespace Foam
136 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
140 // ************************************************************************* //