Equazione differenziale difficile da risolvere con Runge-Kutta

[fede_1_1]

Salve! Mi sono imbattuto in un'equazione differenziale particolare, probabilmente molto difficile, che vorrei risolvere numericamente con i metodi di Runge-Kutta. Il problema è il seguente, fissato $beta=80$:
\begin{cases}

x'=dx/d\phi=\dfrac{ cos(\phi) }{ 2+\beta \cdot z-(1/x) \cdot sin(\phi) } \\

z'=dz/d\phi=\dfrac{ sin(\phi) }{ 2+\beta \cdot z-(1/x) \cdot sin(\phi) } \\

x(\phi=0)=0; \\ z(\phi=0)=0

\end{cases}

Con $\phi \in [0,\pi/2]$. Non so nemmeno se il problema è ben posto ad essere onesto. Fatto sta che ho provato molto naif con un il metodo di Eulero Esplicito e matlab mi pone errore del codice.

function [t,Y]=euleroesplicitoV2(f,a,b,y0,N)

h=(b-a)/N;
m=length(y0);

t=zeros(N+1,1);
Y=zeros(N+1,m);

t(1)=a;

Y(1,:)=y0;

for i=1:N

t(i+1)=a+i*h;

Y(i+1,:)=Y(i,:) + h*(f(t(i),Y(i,:))); % f deve essere riga
end

Ho dato in input f = @ (phi,x,z) [ (cos(phi))/(2+beta*z-(sin(phi)/x )) ; (sin(phi))/ (2+beta*z-(sin(phi)/x ))], $a=0$, $b=\pi/2$, $y0=[0;0]$ e $N=100$.

Qualcuno ha idea su come muoversi? Grazie per l'attenzione! :]

[sellacollesella]

Non me ne intendo di MatLab, ma sicuramente non puoi dividere per \(x(\phi)\) e imporre che per \(\phi=0\) sia \(x=0\), tutt'al più puoi imporre che sia uguale ad un numero "molto piccolo", uno "zero ingegneristico".

A quel punto è sufficiente implementare il metodo di Eulero in un foglio di calcolo scelto a piacere:

Codice:

{Φ, n} = {1.571, 1000};
{x, z, ϕ} = Table[0, {3}, {n}];
{x[[1]], z[[1]], ϕ[[1]]} = {0.001, 0., 0.};

Do[x[[k + 1]] = x[[k]] + Φ/n Cos[ϕ[[k]]]/(2 + 80 z[[k]] - Sin[ϕ[[k]]]/x[[k]]);
   z[[k + 1]] = z[[k]] + Φ/n Sin[ϕ[[k]]]/(2 + 80 z[[k]] - Sin[ϕ[[k]]]/x[[k]]);
   ϕ[[k + 1]] = ϕ[[k]] + Φ/n, {k, n - 1}];

ListLinePlot[Transpose[{x, z}], AspectRatio -> Automatic,
             AxesLabel -> {"x", "z"}, GridLines -> Automatic]


\(\quad\quad\quad\)

[fede_1_1]

Grazie! Su quale programma hai inserito quel codice?
Sull'osservazione per lo zero, adottando la tua soluzione dello "zero ingegneristico", ho provato comunque ad utilizzare il metodo di Runge-Kutta del quarto ordine. Il codice è il seguente, non dà errori che impediscono la risoluzione, ma il risultati che dà forse non sono soddisfacenti.

function [T,V]=capillaryrisesol(N)

beta=80;

f=@(phi,x,z) [ (cos(phi))/(2+beta*z-(sin(phi)/x) ) ; (sin(phi))/(2+beta*z-(sin(phi)/x ))];

a=0.0000000001;
b=pi/2;

v0=[a ;a];

m=length(v0);

h=( b-0 )/N;

T=zeros(1,N+1);
V=zeros(m,N+1);

V(:,1)=v0;
T(1)=0;

k1=f(T(1),a,a);

k2=f( T(1)+h/2, a + (h/2)*k1(1), a + (h/2)*k1(2) );

k3=f( T(1)+h/2, a + (h/2)*k2(1), a + (h/2)*k2(2) );

k4=f( T(1)+h, a+h*k3(1), a+h*k3(2) );

for n=1:N

T(n+1)=0+n*h;

V(:,n+1)=V(:,n) + (h/6)*(k1+2*k2+2*k3+k4);

end

Facendo plot(V(1,:), V(2,:)) esce una retta, ma la soluzione grafica dovrebbe essere effettivamente quella trovata da te. C'è qualcosa che non va nel codice oppure sbaglio nel plottare? Essenzialmente dovrei plottare tutte le coppie date da tutte le colonne di $V$ (che è una matrice 2x1001).

[fede_1_1]

UPGRADES: Plottando su scala logaritmica, con

V1=V(1,:); V2=V(2,:);
semilogx(V1,V2)

Esce fuori un grafico che effettivamente ricorda quello trovato. Ma incrementa troppo tardi, con $N=50$, infatti prima di $x=10^2$ circa la soluzione è zero costantemente, mentre dopo inizia a crescere. Dovrebbe crescere molto prima. Probabilmente il $h$ è troppo grande, meglio usare $h^4$. Utilizzando tale passo si ha che la funzione cresce poco prima di $x=10^-3$. Variando $N$ si ottengono risultati diversi.

Sono molto confuso

[sellacollesella]

Dopo aver letto il tuo primo messaggio, ho aperto Mathematica e ho scritto:

Codice:

{xsol, zsol} = NDSolveValue[{x'[ϕ] == Cos[ϕ]/(2 + 80 z[ϕ] - Sin[ϕ]/x[ϕ]),
                             z'[ϕ] == Sin[ϕ]/(2 + 80 z[ϕ] - Sin[ϕ]/x[ϕ]),
                             x[0] == 10^-3, z[0] == 0}, {x, z}, {ϕ, 0, π/2}];
ParametricPlot[{xsol[ϕ], zsol[ϕ]}, {ϕ, 0, π/2}]

dove, come puoi vedere, mi è bastato copiare il tuo sistema di equazioni differenziali con l'unica accortezza di non imporre \(x(0)=0\), altrimenti è evidente che anche Mathematica, come qualsiasi altro software, si pianti.

A quel punto, non ho fatto altro che implementare il più semplice metodo Runge-Kutta, ossia Eulero:

Codice:

{Φ, n} = {1.571, 1000};
{x, z, ϕ} = Table[0, {3}, {n}];
{x[[1]], z[[1]], ϕ[[1]]} = {0.001, 0., 0.};

Do[x[[k + 1]] = x[[k]] + Φ/n Cos[ϕ[[k]]]/(2 + 80 z[[k]] - Sin[ϕ[[k]]]/x[[k]]);
   z[[k + 1]] = z[[k]] + Φ/n Sin[ϕ[[k]]]/(2 + 80 z[[k]] - Sin[ϕ[[k]]]/x[[k]]);
   ϕ[[k + 1]] = ϕ[[k]] + Φ/n, {k, n - 1}];

ListLinePlot[Transpose[{x, z}], AspectRatio -> Automatic,
             AxesLabel -> {"x", "z"}, GridLines -> Automatic]


ma con più sudore possiamo complicarlo implementando il celeberrimo metodo Runge-Kutta-4:

Codice:

{Φ, n} = {1.571, 1000};
{x, z, ϕ} = Table[0, {3}, {n}];
{x[[1]], z[[1]], ϕ[[1]]} = {0.001, 0., 0.};

f[u_, v_, w_] = Cos[u]/(2 + 80 w - Sin[u]/v);
g[u_, v_, w_] = Sin[u]/(2 + 80 w - Sin[u]/v);
h = Φ/n;

Do[f1 = f[ϕ[[k]], x[[k]], z[[k]]];
   g1 = g[ϕ[[k]], x[[k]], z[[k]]];

   f2 = f[ϕ[[k]] + h/2, x[[k]] + f1 h/2, z[[k]] + f1 h/2];
   g2 = g[ϕ[[k]] + h/2, x[[k]] + g1 h/2, z[[k]] + g1 h/2];

   f3 = f[ϕ[[k]] + h/2, x[[k]] + f2 h/2, z[[k]] + f2 h/2];
   g3 = g[ϕ[[k]] + h/2, x[[k]] + g2 h/2, z[[k]] + g2 h/2];

   f4 = f[ϕ[[k]] + h, x[[k]] + f3 h, z[[k]] + f3 h];
   g4 = g[ϕ[[k]] + h, x[[k]] + g3 h, z[[k]] + g3 h];

   x[[k + 1]] = x[[k]] + (f1 + 2 f2 + 2 f3 + f4) h/6;
   z[[k + 1]] = z[[k]] + (g1 + 2 g2 + 2 g3 + g4) h/6;
   ϕ[[k + 1]] = ϕ[[k]] + h, {k, n - 1}];

ListLinePlot[Transpose[{x, z}], AspectRatio -> Automatic,
             AxesLabel -> {"x", "z"}, GridLines -> Automatic]


dove, entrambi i codici, basandosi su compilazione tabellare, risultano facilmente implementabili in qualsiasi foglio di calcolo, anche semplicemente in Excel, non serve nulla di più sofisticato. Chiaramente, una volta scelto l'ambiente di lavoro, come MatLab, tocca conoscerlo molto bene, altrimenti diventa una roulette russa!

Più di così non saprei aiutarti, superato l'esame di calcolo numerico MatLab è caduto nel dimenticatoio!

[fede_1_1]

Grazie millee! Non sono praticissimo di Mathematica, ma è la volta buona che inizio ad approcciarmi
Comunque, ho ragionato con matlab e sono giunto ad una conclusione che dovrebbe essere equivalente alla tua. Per chiunque sia curioso, lascio qua il codice:

Codice:


function [T,V]=capillaryrisesol(N)

beta=80;

f=@(phi,x,z) [ (cos(phi))/(2+beta*z-(sin(phi)/x) ) ; (sin(phi))/(2+beta*z-(sin(phi)/x ))];

a=0.000001;
b=pi/2;

v0=[a ;0];

m=length(v0);

T=linspace(0,b,N+1);
T(1)=a;
V=zeros(m,N+1);

V(:,1)=v0;

for n=1:N

    h=T(n+1)-T(n);

    k1=f(T(n),V(1,n),V(2,n));

    k2=f( T(n)+h/2, V(1,n) + (h/2)*k1(1), V(2,n) + (h/2)*k1(2)  );

    k3=f( T(n)+h/2, V(1,n) + (h/2)*k2(1), V(2,n) + (h/2)*k2(2) );

    k4=f( T(n)+h, V(1,n)+h*k3(1),  V(2,n)+h*k3(2) );

    V(:,n+1)=V(:,n) + (h/6)*(k1+2*k2+2*k3+k4);

end

Con

Codice:

[T,V]=capillaryrisesolV2(50);
V1=V(1,:); V2=V(2,:);
plot(V1,V2)

Ottengo:



Che mi pare sia piuttosto simile alla tua soluzione

[sellacollesella]

Sembra anche a me, ma per esserne certi c'è un'unica cosa fare, sovrapporre al tuo grafico i punti che ho ottenuto, ad esempio, sin dal principio tramite il metodo di Eulero. Se i due grafici si sovrappongono: BINGO!

Testo nascosto, fai click qui per vederlo

Codice:

{{0.001, 0.},
{0.0017855, 0.},
{0.0031880080661128548, 2.2033419845097114*^-6},
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[fede_1_1]

Perfetto sono equivalenti! Chiaramente qualche cifra decimale cambia però con scarto piuttosto basso. Immagino sia dovuto alla differenza tra i due metodi :] Ho verificato anche sul libro e i risultati son proprio questi Grazie ancora!