NonPhysiologicalContractionModel.cpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2011
00004 
00005 University of Oxford means the Chancellor, Masters and Scholars of the
00006 University of Oxford, having an administrative office at Wellington
00007 Square, Oxford OX1 2JD, UK.
00008 
00009 This file is part of Chaste.
00010 
00011 Chaste is free software: you can redistribute it and/or modify it
00012 under the terms of the GNU Lesser General Public License as published
00013 by the Free Software Foundation, either version 2.1 of the License, or
00014 (at your option) any later version.
00015 
00016 Chaste is distributed in the hope that it will be useful, but WITHOUT
00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00018 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00019 License for more details. The offer of Chaste under the terms of the
00020 License is subject to the License being interpreted in accordance with
00021 English Law and subject to any action against the University of Oxford
00022 being under the jurisdiction of the English Courts.
00023 
00024 You should have received a copy of the GNU Lesser General Public License
00025 along with Chaste. If not, see <http://www.gnu.org/licenses/>.
00026 
00027 */
00028 
00029 
00030 #include "NonPhysiologicalContractionModel.hpp"
00031 #include <math.h>
00032 
00033 #include <iostream>
00034 
00035 NonPhysiologicalContractionModel::NonPhysiologicalContractionModel(unsigned option)
00036     : AbstractAlgebraicContractionModel()
00037 {
00038     assert(option>=1);
00039     assert(option<=3);
00040 
00041     mOption = option;
00042     mStretch = 1.0;
00043 }
00044 
00045 
00046 void NonPhysiologicalContractionModel::SetInputParameters(ContractionModelInputParameters& rInputParameters)
00047 {
00048 }
00049 
00050 void NonPhysiologicalContractionModel::SetStretchAndStretchRate(double stretch, double stretchRate)
00051 {
00052     mStretch = stretch;
00053 }
00054 
00055 double NonPhysiologicalContractionModel::GetActiveTension()
00056 {
00057     if(mOption==1)
00058     {
00059         // implicit and explicit are identical as they should be
00060         return fabs(5*sin(mTime));
00061     }
00062     else if(mOption==2)
00063     {
00064         // small error between them at lowest dt
00065         // next dt, small diff between explicit at lowest dt, mostly due to first timestep
00066         // largest dt (1ms) completely wrong after first timestep => solution translated across
00067         return fabs(5*mStretch*sin(mTime));
00068     }
00069     else
00070     {
00071         // same conclusions as for above
00072         return fabs(5*exp(1-mStretch)*sin(mTime));
00073     }
00074 }
00075 
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