jakob.schratter/SciFEM-Project_CoffeeMugSimulation_Celebic-Schratter
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fixed subdomain indices, CHANGED thermalCondicutivity of ceramic

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jakob.schratter 2026-01-26 11:25:52 +01:00
commit 4c5aa92fdd
4 changed files with 5384 additions and 5388 deletions
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40
mgrid_2/getmatrix.cpp
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@ -428,12 +428,13 @@ void FEM_Matrix::CalculateLaplace_mult(vector<double> &f)
double FEM_Matrix::ThermalConductivity(const int subdomain)
{
// source: https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
double lambda = 0.0;
switch (subdomain)
{
// ceramic mug
case 0:
lambda = 4.0; // anything from 1 to 4
lambda = 6.0; // anything from 1 to 4
break;
// water
@ -447,7 +448,7 @@ double FEM_Matrix::ThermalConductivity(const int subdomain)
break;
default:
lambda = 1.0;
assert(false && "BAD subdomain");
break;
}
@ -456,6 +457,7 @@ double FEM_Matrix::ThermalConductivity(const int subdomain)
double FEM_Matrix::VolumetricHeatCapacity(const int subdomain)
{
// source? https://en.wikipedia.org/wiki/Table_of_specific_heat_capacities
double c = 0.0;
switch (subdomain)
{
@ -465,8 +467,8 @@ double FEM_Matrix::VolumetricHeatCapacity(const int subdomain)
break;
// water
case 1:
c = 4.184 * 1e6;
case 1:
c = 4.184 * 1e6;
break;
// air
@ -475,7 +477,7 @@ double FEM_Matrix::VolumetricHeatCapacity(const int subdomain)
break;
default:
c = 1.0;
assert(false && "BAD subdomain");
break;
}
@ -630,13 +632,13 @@ void FEM_Matrix::ApplyRobinBC_mult(std::vector<double> &f, const double u_out)
int const subdomain = RobinEdgesSubdomains[i];
double const alpha = Heat_transfer_coefficient(subdomain);
//int const EdgeNumber = RobinEdges[i];
int const EdgeNumber = RobinEdges[i];
int const EdgeNode1 = RobinEdgeNodes[2*i];
int const EdgeNode2 = RobinEdgeNodes[2*i + 1];
//cout << "Edge number " << EdgeNumber << ", subdomain: " << subdomain << " ";
//cout << "Node1: " << EdgeNode1 << " Node2: " << EdgeNode2 << " " << endl;
cout << "Edge number " << EdgeNumber << ", subdomain: " << subdomain << " ";
cout << "Node1: " << EdgeNode1 << " Node2: " << EdgeNode2 << " " << endl;
double x_1 = Coordinates[2*EdgeNode1];
double y_1 = Coordinates[2*EdgeNode1 + 1];
@ -666,35 +668,25 @@ void FEM_Matrix::ApplyRobinBC_mult(std::vector<double> &f, const double u_out)
return;
}
// source: https://www.engineeringtoolbox.com/overall-heat-transfer-coefficient-d_434.html
double FEM_Matrix::Heat_transfer_coefficient(const int subdomain)
{
int matlab_sd_index = subdomain - 1;
double alpha = 0.0;
switch (matlab_sd_index)
switch (subdomain)
{
// outside
// ceramic to air
case 0:
alpha = 10.0;
break;
// ceramic
case 1:
alpha = 1.0;
break;
// water
// air to air (Free Convection Gas - Free Convection Gas : U = 1 - 2 W/m2K (typical window, room to outside air through glass))
case 2:
alpha = 500.0;
break;
// air
case 3:
alpha = 10.0;
alpha = 1.0;
break;
default:
alpha = 1.0;
assert(false && "BAD subdomain");
break;
}