Modifying A Variable in an ODEFUN/Boundary Value Problem

1 次查看（过去 30 天）

显示更早的评论

Tony Stianchie 2023-5-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1959999-modifying-a-variable-in-an-odefun-boundary-value-problem

评论： Tony Stianchie 2023-5-8

在 MATLAB Online 中打开

I am trying to modify with each step across my odefun the values of k, mu, and c.

I'd like for these variables for change with each step based on the value calculated for Sxint(4,j)

clc
clear all 
close all
function yprime = odefun(eta,y)
yprime = zeros(5,1);
global m etainf Pr mu k c 
%% Plotting Velocity and Temperature 
etainf = 20; % Find Convergence for both Temp and Velocity
Pr = 0.7; % Enter Pr 
   
for m = [0] 
  
solinit = bvpinit(linspace(0,etainf,100),[0 0 0 1 0]);
sol = bvp4c(@odefun, @odefun_bc,solinit);
xint = linspace(0,etainf,100);
Sxint = deval(sol,xint);
for j = 1:etainf
      
    mu = (Sxint(4,j))^0.7;
    c = (Sxint(4,j))^0.19;
    k = (Sxint(4,j))^0.85;
    
figure(1)
hold on 
title('Velocity vs Eta, Pr = 0.1')
xlabel('Eta')
ylabel('Velocity')
plot(xint,Sxint(2,:)); % plots f' (velocity)
figure(2)
hold on
title('Temperature vs Eta, Pr = 0.1')
xlabel('Eta')
ylabel('Temperature')
plot(xint,Sxint(4,:)); % plots q (temp profile) 
end
end