## 100 Reputation

3 years, 202 days

## How do I solve a Blasius problem in Shoo...

Maple 18

I tried to solve a Blasius problem (available in maple), but I have an error. How to solve this issue.

## How do I solve ODE system in RK method?...

Maple 18

How to solve and plot a ODE system in RK method.
eq1 := diff(f(x), x, x, x)-(1/2)*Sc*sin(alpha)*g(x)*(diff(g(x), x, x))+(1/2)*x*cos(alpha)*(diff(f(x), x, x))+(1/2)*sin(alpha)*f(x)*(diff(f(x), x, x)) = 0; eq2 := (diff(g(x), x, x, x))/Pm+(1/2)*x*cos(alpha)*(diff(g(x), x, x))+sin(alpha)*f(x)*(diff(g(x), x, x))-sin(alpha)*(diff(f(x), x, x))*g(x) = 0; eq3 := (diff(theta(x), x, x))/Pr+(1/2)*x*cos(alpha)*(diff(theta(x), x))+(1/2)*x*(diff(f(x), x))*(diff(theta(x), x))+sin(alpha)*(x*(diff(f(x), x))-f(x))*(diff(theta(x), x))-Nb*(diff(s(x), x))*(diff(theta(x), x))-Nt*(diff(theta(x), x))^2+(1/4)*Sc*Br*sin(alpha)^2*(diff(f(x), x))^2*(x*(diff(g(x), x))-g(x))+(diff(g(x), x))^2*(x*(diff(f(x), x))-f(x)) = 0; eq4 := diff(s(x), x, x)+S*((1/2)*cos(alpha)*x*(diff(s(x), x))+(1/2)*sin(alpha)*f(x)*(diff(s(x), x)))+Nt*(diff(theta(x), x, x))/Nb = 0

ics := f(0) = 0, (D(f))(0) = 1, g(0) = 0, (D(g))(0) = 1, theta(0) = 1, s(0) = 1; bcs := (D(f))(100) = 0, (D(g))(100) = 0, theta(100) = 0, s(100) = 0

alpha = - 30 degree, Sc = 1.0, Pm = .1, Pr = 6.2, Nb = .1, Nt = .1, Br = .5, S = 1

## How do I solve system of differential e...

Maple 18

How do  I solve system of differential equations in finite difference method or finite element method?

eq1 := (diff(f(x), x, x, x))*(a*beta*f(x)^2-1)+(diff(f(x), x))^2-2*a*beta*f(x)*(diff(f(x), x))*(diff(f(x), x, x))+(diff(f(x), x))*(M+k[1])-(diff(f(x), x, x))*f(x)-(alpha*theta(x)+delta*phi(x))/rho = 0;

eq2 := -(diff(theta(x), x, x))*K[SB]*(Df-(Rd+k[hnf]/k[bf])/Pr)+N[t]*K[SB]*(diff(theta(x), x))^2-N[b]*(diff(theta(x), x))*(diff(phi(x), x))-(diff(f(x), x))*(diff(theta(x), x))-lambda*theta(x)-mu*Ec*(M*(diff(f(x), x))^2+(diff(f(x), x, x))^2) = 0;

eq3 := diff(phi(x), x, x)+Le*Sr*(diff(theta(x), x, x))+Le*f(x)*(diff(phi(x), x)) = 0;

ics := f(0) = 0, (D(f))(0) = 0, theta(0) = 1, phi(0) = 1;

bcs := (D(f))(100) = 0, theta(100) = 0, phi(100) = 0;

Parameters1 := rho = 2063.905, k[hnf] = .29942, k[bf] = .2520, mu = .38694, a = .1, beta = 5, k[1] = 2.0, M = 10, alpha = 20, delta = 20, K[SB] = .5, Df = 3, Pr = 1.2, Rd = 5, N[t] = 1.2, N[b] = 1.0, lambda = 1.5, Ec = 5, Le = .1, Sr = .1;

## How do I solve delay differential equati...

Maple 18

How to solve delay differential equations in maple?

restart;
with(PDETools);
eq1 := (D(x))(t) = 2*a[4]*y(t)-c[1]*z(t)*x(t)-d[2]*x(t)-a[1]*x(t-tau);

eq2 := (D(y))(t) = a[1]*x(t-tau)-d[3]*y(t)-a[4]*y(t)-c[3]*z(t)*y(t)-k[1]*(1-exp(-k[2]*w(t)))*y(t);

eq3 := (D(z))(t) = K+rho*z(t)*(x(t)+y(t))^3/(alpha+(x(t)+y(t))^3)-c[2]*z(t)*x(t)-c[4]*y(t)*z(t)-d[1]*z(t)-k[3]*(1-exp(-k[4]*w(t)))*z(t);

eq4 := (D(w))(t) = -gamma*w(t);

ics := x(0) = 1, y(0) = 1, z(0) = 1, w(0) = 1;

Parameters := a[1] = .84, a[4] = .91, c[1] = 7.56*10^(-2), c[3] = 7.56*10^(-2), c[2] = 3.422*10^(-4), c[4] = 3.422*10^(-4), d[1] = 0.4e-1, d[2] = .11, d[3] = .66, K = 0.37e-1;

## How to sol;ve differential equations wit...

Maple 18

I tried to solve differential equations with boundary conditions, but I boundary conditions are tends to infinity. How to sol;ve this?N1.mw

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