45 lines
1.9 KiB
C++
45 lines
1.9 KiB
C++
// This file is part of BUDEES, a software that allows fast simulation of bubble dynamics in electrolyzers and their interactions with electrical parameters.
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//
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// Copyright (C) 2024 <CNRS-ENS Rennes-Université de Rennes-CY Cergy Paris Université-Université Paris Saclay-CNAM Paris-ENS Paris-Saclay>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/
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TimeSteps updateTimestep(TimeSteps& timesteps, double maxRadius, double maxVelocity, vector<Site>& Sites, bool* stopFlag) {
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// Nucleation growing rate
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double growingFactorMax = 0;
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for (vector<Site>::iterator it = Sites.begin(); it != Sites.end(); it++)
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growingFactorMax = MAX(growingFactorMax, it->growth);
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double TgrowthMin = RFritzMin/growingFactorMax;
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double dtMaximal1 = TgrowthMin/GROWING_TIME_COEF;
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// Equilibrium buoyancy velocity
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double UElec = abs(bPrefactor*mathSQ(maxRadius));
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double dtElec = 2*maxRadius/(ELECTRICAL_TIME_COEF*UElec);
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// Check Reynolds
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double U = abs(bPrefactor*mathSQ(maxRadius));
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double dtMaximal2 = 2*maxRadius/(BUOYANCY_TIME_COEF*U);
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double reynolds = (rho/mu)*maxVelocity*maxRadius;
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if (reynolds > 10) {
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errorProgress("reynolds number too high (Re=" + std::to_string(reynolds) + ")");
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*stopFlag = true;
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}
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// Return the smallest value
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double dt = MIN(dtMaximal1, dtMaximal2);
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return {dt, dtElec, timesteps.i, timesteps.iElec};
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}
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