Creation of OpenFOAM-dev repository 15/04/2008

src/engine/engineTime/engineTime.C

@@ -0,0 +1,238 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 1991-2007 OpenCFD Ltd.
+     \\/     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 2 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, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+\*---------------------------------------------------------------------------*/
+
+#include "engineTime.H"
+#include "mathematicalConstants.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+//- Construct from objectRegistry arguments
+engineTime::engineTime
+(
+    const word& name,
+    const fileName& rootPath,
+    const fileName& caseName,
+    const fileName& systemName,
+    const fileName& constantName
+)
+:
+    Time
+    (
+        name,
+        rootPath,
+        caseName,
+        systemName,
+        constantName
+    ),
+    engineGeometry_
+    (
+        IOobject
+        (
+            "engineGeometry",
+            constant(),
+            *this,
+            IOobject::MUST_READ,
+            IOobject::NO_WRITE,
+            false
+        )
+    ),
+    conRodLength_(engineGeometry_.lookup("conRodLength")),
+    bore_(engineGeometry_.lookup("bore")),
+    stroke_(engineGeometry_.lookup("stroke")),
+    clearance_(engineGeometry_.lookup("clearance")),
+    rpm_(engineGeometry_.lookup("rpm"))
+{
+    value() = degToTime(value());
+
+    startTime_ = degToTime(startTime_);
+    endTime_ = degToTime(endTime_);
+
+    deltaT_ = degToTime(deltaT_);
+    deltaT0_ = deltaT_;
+
+    if 
+    (
+        writeControl_ == wcRunTime
+     || writeControl_ == wcAdjustableRunTime
+    )
+    {
+        writeInterval_ = degToTime(writeInterval_);
+    }
+}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+// Read the controlDict and set all the parameters
+bool engineTime::read()
+{
+    if (!Time::read())
+    {
+        return false;
+    }
+    else
+    {
+        deltaT_ = degToTime(deltaT_);
+        endTime_ = degToTime(endTime_);
+
+        if 
+        (
+            writeControl_ == wcRunTime
+         || writeControl_ == wcAdjustableRunTime
+        )
+        {
+            writeInterval_ = degToTime(writeInterval_);
+        }
+
+        return true;
+    }
+}
+
+
+scalar engineTime::degToRad(const scalar deg) const
+{
+    return mathematicalConstant::pi*deg/180.0;
+}
+
+
+scalar engineTime::degToTime(const scalar theta) const
+{
+    return theta/(360.0*rpm_.value()/60.0);
+}
+
+
+scalar engineTime::timeToDeg(const scalar t) const
+{
+    return t*(360.0*rpm_.value()/60.0);
+}
+
+
+scalar engineTime::theta() const
+{
+    return timeToDeg(value());
+}
+
+
+// Return current crank-angle translated to a single revolution
+// (value between -180 and 180 with 0 = top dead centre)
+scalar engineTime::thetaRevolution() const
+{
+    scalar t = theta();
+
+    while (t > 180.0)
+    {
+        t -= 360.0;
+    }
+
+    while (t < -180.0)
+    {
+        t += 360.0;
+    }
+
+    return t;
+}
+
+
+scalar engineTime::deltaTheta() const
+{
+    return timeToDeg(deltaT().value());
+}
+
+
+scalar engineTime::pistonPosition(const scalar theta) const
+{
+    return
+    (
+        conRodLength_.value()
+      + stroke_.value()/2.0
+      + clearance_.value()
+    )
+  - (
+        stroke_.value()*::cos(degToRad(theta))/2.0
+      + ::sqrt
+        (
+            sqr(conRodLength_.value())
+            - sqr(stroke_.value()*::sin(degToRad(theta))/2.0)
+        )
+    );
+}
+
+
+dimensionedScalar engineTime::pistonPosition() const
+{
+    return dimensionedScalar
+    (
+        "pistonPosition",
+        dimLength,
+        pistonPosition(theta())
+    );
+}
+
+
+dimensionedScalar engineTime::pistonDisplacement() const
+{
+    return dimensionedScalar
+    (
+        "pistonDisplacement",
+        dimLength,
+        pistonPosition(theta() - deltaTheta()) - pistonPosition().value()
+    );
+}
+
+
+dimensionedScalar engineTime::pistonSpeed() const
+{
+    return dimensionedScalar
+    (
+        "pistonSpeed",
+        dimLength/dimTime,
+        pistonDisplacement().value()/(deltaT().value() + VSMALL)
+    );
+}
+
+
+scalar engineTime::userTimeToTime(const scalar theta) const
+{
+    return degToTime(theta);
+}
+
+
+scalar engineTime::timeToUserTime(const scalar t) const
+{
+    return timeToDeg(t);
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// ************************************************************************* //