How set up a parameter in the PDE Modeler App as a function?

Good morning,

i'm studying the freezing process of mozzarella cheese: for T>0°C there is a heat exchange by convection for water content, but for T <0 °C the heat exchange is by conduction due to the presence of ice.

How set up these coefficient as a function? For example refering the value from Matlab's script? With a "IF Cycle? With a Overlay of convection and conduction effect?

I'ven't idea :(

Answer 1

[Nihal]

In MATLAB App Designer, calling a function like the calculateHeatTransferCoefficient function from within your app requires you to follow a specific structure. This involves either integrating the function directly into one of your app's callback functions or into a separate function file that is part of your app. Below is a step-by-step guide on how to do this:

Step 1: Define the Function Within Your App

If your function is relatively short and specific to your app, you can define it directly within the app code. In App Designer, you typically place custom function definitions at the end of the app class file, outside of any callback functions.

1. Open your app in App Designer.
2. Navigate to the Code View.
3. Scroll to the bottom of the code.
4. Define the function after the last end statement of the last property, callback, or function.

methods (Access = private)


function h = calculateHeatTransferCoefficient(app, T)

h_convection = 10; % Example value

h_conduction = 5;  % Example value


if T > 0
    
    h = h_convection;
    
else
    
    h = h_conduction;
    
end

end

end

Note that app is passed as the first argument to the function. This is necessary for any function defined within the App Designer that needs to access or modify app properties.

Step 2: Call the Function from a Callback or Another Function

You can now call calculateHeatTransferCoefficient from any callback or function within your app. For example, if you want to call this function when a button is pressed:

1. Add a Button component to your app's UI (if you haven't already).
2. Go to the Code View and find the callback function for the button press.

It might look something like this:

% Button pushed function: CalculateButton

function CalculateButtonPushed(app, event)

T = app.TemperatureEditField.Value; % Assuming you have a field to input temperature

h = app.calculateHeatTransferCoefficient(T);

% Now you can use 'h' for further calculations or display it in the app

app.ResultLabel.Text = ['Heat Transfer Coefficient: ', num2str(h)];

end

By following these steps, you should be able to integrate the calculateHeatTransferCoefficient function into your MATLAB App Designer project and call it based on user input or other app interactions.