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Changed the upper boundary to lower order scheme for now

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p.vanderwilt
2025-06-30 15:46:13 +02:00
parent b2d32ba9f2
commit 3cc876533c
1 changed files with 16 additions and 9 deletions
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21
dependencies/reactor_class.js vendored
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@@ -103,8 +103,10 @@ class Reactor_PFR {
this.timeStep = 1/(24*60*15); // time step [d] this.timeStep = 1/(24*60*15); // time step [d]
this.speedUpFactor = 60; this.speedUpFactor = 60;
this.D_op = this.makeDoperator(true); this.D_op = this.makeDoperator(true, true);
this.D2_op = this.makeD2operator(); this.D2_op = this.makeD2operator();
this.alpha = 0.001; // boundary condition modifier
} }
set setInfluent(input) { // setter for C_in (WIP) set setInfluent(input) { // setter for C_in (WIP)
@@ -183,7 +185,7 @@ class Reactor_PFR {
const BC_gradient = Array(this.n_x).fill(0.0); const BC_gradient = Array(this.n_x).fill(0.0);
BC_gradient[0] = -1; BC_gradient[0] = -1;
BC_gradient[1] = 1; BC_gradient[1] = 1;
const BC_dispersion = math.multiply(this.D * this.A / (math.sum(this.Fs)*this.d_x), [BC_gradient], new_state)[0]; const BC_dispersion = math.multiply(this.alpha*this.D * this.A / (math.sum(this.Fs)*this.d_x), [BC_gradient], new_state)[0];
console.log(math.add(BC_C_in, BC_dispersion)); console.log(math.add(BC_C_in, BC_dispersion));
new_state[0] = math.add(BC_C_in, BC_dispersion).map(val => val < 0 ? 0 : val); new_state[0] = math.add(BC_C_in, BC_dispersion).map(val => val < 0 ? 0 : val);
@@ -208,16 +210,22 @@ class Reactor_PFR {
const A = math.resize(math.diag(Array(this.n_x).fill(-2/3), -1), [this.n_x, this.n_x]); const A = math.resize(math.diag(Array(this.n_x).fill(-2/3), -1), [this.n_x, this.n_x]);
const B = math.resize(math.diag(Array(this.n_x).fill(2/3), 1), [this.n_x, this.n_x]); const B = math.resize(math.diag(Array(this.n_x).fill(2/3), 1), [this.n_x, this.n_x]);
const C = math.resize(math.diag(Array(this.n_x).fill(-1/12), 2), [this.n_x, this.n_x]); const C = math.resize(math.diag(Array(this.n_x).fill(-1/12), 2), [this.n_x, this.n_x]);
const D = math.add(I, A); const D = math.add(I, A, B, C);
D[1][0] = -1;
D[1][1] = 0;
D[1][2] = 1;
D[1][3] = 0;
const NearBoundary = Array(this.n_x).fill(0.0); const NearBoundary = Array(this.n_x).fill(0.0);
NearBoundary[1] = -25/12; NearBoundary[1] = -25/12;
NearBoundary[2] = 4; NearBoundary[2] = 4;
NearBoundary[3] = -3; NearBoundary[3] = -3;
NearBoundary[4] = 4/3; NearBoundary[4] = 4/3;
NearBoundary[5] = -1/4; NearBoundary[5] = -1/4;
D[1] = NearBoundary;
NearBoundary.reverse(); NearBoundary.reverse();
D[this.n_x-2] = math.multiply(-1, NearBoundary) D[this.n_x-2] = NearBoundary;
D[0] = Array(this.n_x).fill(0); // set by BCs elsewhere
D[this.n_x-1] = Array(this.n_x).fill(0);
return D;
} else { } else {
throw new Error("Upwind higher order method not implemented! Use central scheme instead."); throw new Error("Upwind higher order method not implemented! Use central scheme instead.");
} }
@@ -225,12 +233,11 @@ class Reactor_PFR {
const I = math.resize(math.diag(Array(this.n_x).fill(1/(1+central)), central), [this.n_x, this.n_x]); const I = math.resize(math.diag(Array(this.n_x).fill(1/(1+central)), central), [this.n_x, this.n_x]);
const A = math.resize(math.diag(Array(this.n_x).fill(-1/(1+central)), -1), [this.n_x, this.n_x]); const A = math.resize(math.diag(Array(this.n_x).fill(-1/(1+central)), -1), [this.n_x, this.n_x]);
const D = math.add(I, A); const D = math.add(I, A);
}
D[0] = Array(this.n_x).fill(0); // set by BCs elsewhere D[0] = Array(this.n_x).fill(0); // set by BCs elsewhere
D[this.n_x-1] = Array(this.n_x).fill(0); D[this.n_x-1] = Array(this.n_x).fill(0);
return D; return D;
} }
}
makeD2operator() { // create the central second derivative operator makeD2operator() { // create the central second derivative operator
const I = math.diag(Array(this.n_x).fill(-2), 0); const I = math.diag(Array(this.n_x).fill(-2), 0);