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5648be03f0
- the blockMesh interface is splineEdge.H, selectable as "spline" The first tests look fine - it works as expected for the case with buggy polySpline reported on the forum. Should of course do some more extensive testing. The advantages compared to the current B-Spline implementation: - Doesn't need a matrix solver. - The coding resembles something that can be found in the literature. - In contrast to the B-Spline implementation, it is fairly clear what is actually going on. I don't even know if the B-Spline are actually B-Spline, Beta-Splines or something else. - Catmull-Rom splines seem to be what all the graphics people have as their stable workhorse. We now have 3 different names for splines in blockMesh: - "spline" - *new* Catmull-Rom for arbitrary segments. - "simpleSpline" - B-Spline for a single segment - "polySpline" - B-Spline for a multiple segments Assuming the Catmull-Rom splines continue to behave nicely, there is no reason to keep the other (broken) B-Splines. This would help clean up the blockMesh interface too. Placed the older ones under legacy/ for easier identification in the future. TODO: - currently no handling of non-zero end tangents - could be extended to handle closed loops, which might be useful for feature edges from CAD (eg, for the cvm mesher)
151 lines
4.0 KiB
C
151 lines
4.0 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 (C) 1991-2009 OpenCFD Ltd.
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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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\*---------------------------------------------------------------------------*/
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#include "polySplineEdge.H"
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#include "BSpline.H"
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#include "addToRunTimeSelectionTable.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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defineTypeNameAndDebug(polySplineEdge, 0);
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addToRunTimeSelectionTable(curvedEdge, polySplineEdge, Istream);
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}
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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// intervening : returns a list of the points making up the polyLineEdge
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// which describes the spline. nBetweenKnots is the number of points
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// placed between each knot : this ensures that the knot locations
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// are retained as a subset of the polyLine points.
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// note that the points are evenly spaced in the parameter mu, not
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// in real space
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Foam::pointField Foam::polySplineEdge::intervening
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(
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const pointField& otherknots,
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const label nBetweenKnots,
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const vector& fstend,
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const vector& sndend
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)
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{
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BSpline spl
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(
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appendEndPoints(curvedEdge::points_, start_, end_, otherknots),
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fstend,
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sndend
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);
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const label nSize
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(
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otherknots.size() * (1 + nBetweenKnots) + nBetweenKnots + 2
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);
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const label NKnots = spl.nKnots();
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const scalar init = 1.0/(NKnots - 1);
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scalar interval = (NKnots - scalar(3.0))/NKnots;
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interval /= otherknots.size() + 1;
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interval /= nBetweenKnots + 1;
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pointField ans(nSize);
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ans[0] = curvedEdge::points_[start_];
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register scalar index(init);
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for (register label i=1; i<nSize-1; i++)
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{
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index += interval;
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ans[i] = spl.realPosition(index);
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}
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ans[nSize-1] = curvedEdge::points_[end_];
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return ans;
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::polySplineEdge::polySplineEdge
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(
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const pointField& points,
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const label start,
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const label end,
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const pointField& otherknots,
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const label nInterKnots
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)
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:
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curvedEdge(points, start, end),
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polyLine
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(
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intervening
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(
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otherknots,
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nInterKnots,
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vector::zero,
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vector::zero
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)
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),
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otherKnots_(otherknots)
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{}
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Foam::polySplineEdge::polySplineEdge
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(
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const pointField& points,
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Istream& is
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)
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:
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curvedEdge(points, is),
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polyLine(pointField(0)),
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otherKnots_(is)
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{
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label nInterKnots(20);
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vector fstend(is);
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vector sndend(is);
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polyLine::points_ = intervening(otherKnots_, nInterKnots, fstend, sndend);
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calcParam();
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::point Foam::polySplineEdge::position(const scalar mu) const
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{
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return polyLine::position(mu);
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}
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Foam::scalar Foam::polySplineEdge::length() const
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{
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return polyLine::length();
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}
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// ************************************************************************* //
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