db7fac3f24
git-svn-id: https://openfoam-extend.svn.sourceforge.net/svnroot/openfoam-extend/trunk/Core/OpenFOAM-1.5-dev@1731 e4e07f05-0c2f-0410-a05a-b8ba57e0c909
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright held by original author
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Description
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spline class : define a basic spline on nKnots knots - this
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does not go anywhere near these knots (will act as a base type for
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various splines that will have real uses)
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\*---------------------------------------------------------------------------*/
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#include "spline.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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// Construct from components
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spline::spline(const pointField& a)
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:
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knots_(a)
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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// function B : this is the blending function for constructing the
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// spline
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scalar spline::B(const scalar& tau) const
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{
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scalar value = 0.0;
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if (tau>=2.0 || tau<=-2.0)
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{
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value = 0.0;
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}
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else if (tau<=-1.0)
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{
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value = pow((2.0 + tau),3.0)/6.0;
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}
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else if (tau<=0.0)
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{
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value = (4.0 - 6.0*tau*tau - 3.0*tau*tau*tau)/6.0;
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}
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else if (tau<=1.0)
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{
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value = (4.0 - 6.0*tau*tau + 3.0*tau*tau*tau)/6.0;
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}
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else if (tau<=2.0)
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{
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value = pow((2.0 - tau),3.0)/6.0;
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}
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else
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{
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FatalErrorIn("spline::B(const scalar&)")
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<< "How the hell did we get here???, "
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<< "tau = " << tau
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<< abort(FatalError);
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}
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return value;
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}
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// position : returns the position along the spline corresponding to the
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// variable mu1
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vector spline::position(const scalar mu1) const
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{
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vector tmp(vector::zero);
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for (register label i=0; i<knots_.size(); i++)
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{
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tmp += B((knots_.size() - 1)*mu1 - i)*knots_[i];
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}
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return tmp;
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}
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//- Return the length of the spline curve
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scalar spline::length() const
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{
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notImplemented("spline::length() const");
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return 1.0;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// ************************************************************************* //
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