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fix(advection): correct flux calculation in advection scheme

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This commit is contained in:
Max Lübke 2025-02-11 14:17:06 +01:00
parent da8973674e
commit f2f4d6fca8
1 changed files with 9 additions and 10 deletions
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19
include/tug/Advection/Advection.hpp
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@ -9,6 +9,7 @@
#include "tug/Core/Matrix.hpp"
#include <Eigen/src/Core/Array.h>
#include <Eigen/src/Core/AssignEvaluator.h>
#include <Eigen/src/Core/Matrix.h>
#include <algorithm>
#include <cstddef>
@ -190,8 +191,7 @@ private:
cellIndex < 0 ? BC_SIDE_LEFT : BC_SIDE_RIGHT, row_i);
// if we have a constant boundary, we use the value of the boundary
if (bcElement.getType() == BC_TYPE_CONSTANT) {
currentFlux =
currentVelo * bcElement.getValue() * (innerTimestep) / dx;
currentFlux = currentVelo * bcElement.getValue();
continue;
}
@ -201,8 +201,7 @@ private:
}
// otherwise we use the concentration of the inflow/outflow cell,
// multiplied by the velocity
currentFlux = currentVelo * oldConcentrations(row_i, cellIndex) *
innerTimestep / dx;
currentFlux = currentVelo * oldConcentrations(row_i, cellIndex);
}
}
@ -219,8 +218,7 @@ private:
// if we have a constant boundary, we use the value of the
// boundary
if (bcElement.getType() == BC_TYPE_CONSTANT) {
currentFlux =
currentVelo * bcElement.getValue() * (2 * innerTimestep) / dy;
currentFlux = currentVelo * bcElement.getValue();
continue;
}
@ -230,8 +228,7 @@ private:
}
// otherwise we use the concentration of the inflow/outflow cell,
// multiplied by the velocity
currentFlux = currentVelo * oldConcentrations(cellIndex, col_i) *
innerTimestep / dy;
currentFlux = currentVelo * oldConcentrations(cellIndex, col_i);
}
}
@ -241,8 +238,10 @@ private:
const T horizontalFlux =
fluxX(row_i, col_i) - fluxX(row_i, col_i + 1);
const T verticalFlux = fluxY(row_i, col_i) - fluxY(row_i + 1, col_i);
newConcentrations(row_i, col_i) =
oldConcentrations(row_i, col_i) + horizontalFlux + verticalFlux;
newConcentrations(row_i, col_i) = oldConcentrations(row_i, col_i) +
innerTimestep /
porevolume(row_i, col_i) *
(horizontalFlux + verticalFlux);
}
}