Is it possible to create a Simulink model from my code?

Question

Lars Nevermann 2023-2-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/1914445-is-it-possible-to-create-a-simulink-model-from-my-code

回答： Sarthak 2023-2-21

I am new to Matlab and Simulink and i just created some code in Matlab and i tried to do the same thing in Simulink but i was not able to complete it. I was not able to reproduce the system by only using Simulink blocks because i did not find any possibility to get access to the data for the temperatures in previous timesteps. I also tried to use the Simulink function block but it did not work as well because i was not able to get an vector as output.

clear all
% Constants
roh_w = 983.2;
cp_w = 4183;
lambda_w = 0.6544;
dt = 2.5;
m_strom = 1;
r = 0.5;
h = 2.5;
Tanklayers = 60;
Timesteps = 1440;
T_Start = 80;
T_in = 50;
A_Tank = pi*r^2;
h_layer = h/Tanklayers;
v_w = m_strom/(roh_w*A_Tank);
CFL = (v_w*dt)/h_layer;
Fo = (lambda_w*dt)/(roh_w*cp_w*h_layer^2);
T = zeros(Tanklayers,1);
T_store = zeros(Tanklayers,Timesteps);
% Calculating the temperature in the tank
for x = 1 : Timesteps
    T_old = T;
    if x == 1
        for y = 1 : Tanklayers
            T(y) = 80;
        end
    else
        for y = 1 : Tanklayers
            if y == 1
                T(y) = (Fo + CFL)*T_in + (1 - 2*Fo - CFL)*T_old(y) + Fo*T_old(y+1);
            elseif y == Tanklayers
                T(y) = (Fo + CFL)*T_old(y-1) + (1 - 2*Fo - CFL)*T_old(y) + Fo*T_old(y);
            else
                T(y) = (Fo + CFL)*T_old(y-1) + (1 - 2*Fo - CFL)*T_old(y) + Fo*T_old(y+1);
            end
        end
        T_store(:,x) = T;
    end
    
end
figure
plot(T_store(50,:))
hold on
ylabel("Temperatur [°C]")
xlabel("Timestep")

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Answer 1

Sarthak 2023-2-21

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Hi Lars,

As mentioned, you tried using the function block but could not get a vector as an output. I believe you have not made the appropriate changes to your function code. The MATLAB function should have the correct input and output variable with the correct return type. If you return a vector, you will get a vector as an output. You can use the DEMUX block to segregate the variables.