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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "arcEdge.H"
#include "units.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace blockEdges
{
defineTypeNameAndDebug(arcEdge, 0);
addToRunTimeSelectionTable(blockEdge, arcEdge, Istream);
}
}
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
void Foam::blockEdges::arcEdge::calc(const point& pA)
{
const tensor dps(pA - p0_, pA - p1_, (pA - p0_)^(pA - p1_));
const tensor pMs((p0_ + pA)/2, (p1_ + pA)/2, pA);
if (det(dps) < vSmall)
{
FatalErrorInFunction
<< "Arc point " << pA << " lies on the line of edge "
<< edge(start_, end_) << abort(FatalError);
}
const point c =
inv(dps)
& vector(dps.x() & pMs.x(), dps.y() & pMs.y(), dps.z() & pMs.z());
const vector r0 = p0_ - c, r1 = p1_ - c;
const scalar cosT = (r0 & r1)/(mag(r0)*mag(r1));
scalar t = acos(max(-1, min(cosT, 1)));
if (((r0 ^ r1) & dps.z()) > 0)
{
t = 2*constant::mathematical::pi - t;
}
centre_ = c;
axis_ = - normalised(dps.z());
theta_ = t;
length_ = 0;
}
void Foam::blockEdges::arcEdge::calc(const scalar theta, const vector& axis)
{
if (0 >= theta || theta >= 360)
{
FatalErrorInFunction
<< "Arc angle for edge " << edge(start_, end_)
<< " must take a value between 0 and 360 degrees"
<< abort(FatalError);
}
const vector dp = p1_ - p0_;
const vector pM = (p0_ + p1_)/2;
const vector rM = normalised(dp ^ axis);
const scalar l = dp & axis;
const vector chord = dp - l*axis;
const scalar magChord = mag(chord);
centre_ = pM - l*axis/2 - rM*magChord/2/tan(theta/2);
axis_ = axis;
theta_ = theta;
length_ = l;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::blockEdges::arcEdge::arcEdge
(
const dictionary& dict,
const label index,
const searchableSurfaceList& geometry,
const pointField& points,
Istream& is
)
:
blockEdge(dict, index, points, is),
p0_(points_[start_]),
p1_(points_[end_]),
centre_(),
axis_(),
theta_(),
length_()
{
token firstToken(is);
is.putBack(firstToken);
if (firstToken == token::BEGIN_LIST)
{
const point pA(is);
calc(pA);
}
else
{
const scalar theta = degToRad(readScalar(is));
const vector axis(is);
calc(theta, normalised(axis));
}
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::point Foam::blockEdges::arcEdge::position(const scalar lambda) const
{
if (lambda < - small || lambda > 1 + small)
{
FatalErrorInFunction
<< "Parameter out of range, lambda = " << lambda
<< abort(FatalError);
}
const scalar t = theta_*lambda;
const vector r1 = p0_ - centre_, r2 = axis_ ^ r1;
return centre_ + r1*cos(t) + r2*sin(t) + axis_*length_*lambda;
}
Foam::scalar Foam::blockEdges::arcEdge::length() const
{
const vector r1 = p0_ - centre_;
// Length of a helical segment
return theta_*sqrt(magSqr(r1) + sqr(length_));
}
// ************************************************************************* //
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