1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 2004-2010 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
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25 Foam::limitedCubicLimiter
28 Class with limiter function which returns the limiter for the
29 TVD limited centred-cubic differencing scheme based on r obtained from
30 the LimiterFunc class.
32 Used in conjunction with the template class LimitedScheme.
37 \*---------------------------------------------------------------------------*/
39 #ifndef limitedCubic_H
40 #define limitedCubic_H
44 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
49 /*---------------------------------------------------------------------------*\
50 Class limitedCubicLimiter Declaration
51 \*---------------------------------------------------------------------------*/
53 template<class LimiterFunc>
54 class limitedCubicLimiter
63 limitedCubicLimiter(Istream& is)
69 FatalIOErrorIn("limitedCubicLimiter(Istream& is)", is)
70 << "coefficient = " << k_
71 << " should be >= 0 and <= 1"
72 << exit(FatalIOError);
75 // Avoid the /0 when k_ = 0
76 twoByk_ = 2.0/max(k_, SMALL);
81 const scalar cdWeight,
82 const scalar faceFlux,
83 const typename LimiterFunc::phiType& phiP,
84 const typename LimiterFunc::phiType& phiN,
85 const typename LimiterFunc::gradPhiType& gradcP,
86 const typename LimiterFunc::gradPhiType& gradcN,
90 scalar twor = twoByk_*LimiterFunc::r
92 faceFlux, phiP, phiN, gradcP, gradcN, d
106 // Calculate the face value using cubic interpolation
108 cdWeight*(phiP - 0.25*(d & gradcN))
109 + (1 - cdWeight)*(phiN + 0.25*(d & gradcP));
111 scalar phiCD = cdWeight*phiP + (1 - cdWeight)*phiN;
113 // Calculate the effective limiter for the cubic interpolation
114 scalar cubicLimiter = (phif - phiU)/stabilise(phiCD - phiU, SMALL);
122 return max(min(cubicLimiter, 2), 0);
125 // Limit the limiter to obey the TVD constraint
126 return max(min(min(twor, cubicLimiter), 2), 0);
131 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
133 } // End namespace Foam
135 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
139 // ************************************************************************* //