MATLAB: How to define a time dependent boundary heat source using the Partial Differential Equation (PDE) Toolbox

boundarycreatepdeheat sourcepdethermaltime-dependenttransient

Dear Community,
Is it possible define a time dependent thermal boundary heat source, which is only active at a defined moment of time ? So that I can analyze afterwards the heat diffusion over time.
t = 0; q = 200000; t > 0s; q = 0;
My code:
 thermalmodel = createpde('thermal','transient');
 %Import and plot the block geometry.
 importGeometry(thermalmodel,'****.stl'); 
 (...)
 thermalProperties(thermalmodel,'ThermalConductivity',k, ...
                               'SpecificHeat',cp, ...
                               'MassDensity',rho);
 Fs = 100;
 tlist = 0:1/Fs:100;
 T0 = 300;
 thermalIC(thermalmodel,T0);
 thermalBC(thermalmodel,'Face',5,...
                         'HeatFlux',@externalHeatFlux,'Vectorized','on');
 result = solve(thermalmodel,tlist);
 T = result.Temperature;
 function Qflux = externalHeatFlux(region,state)
    if t = tlist(1,1) % t = 0
        Qflux = q;
    else
        Qflux = 0;
    end
 end
Many thanks in advance.

Best Answer

I think, but am not 100% sure, that the question makes no sense as posed. An instantaneous flux will not cause any change in the heat. You need to define a (short) time over which the flux is active. I believe that the situation is like this recent Answer, which has a bit of detail on what to do.
Alan Weiss
MATLAB mathematical toolbox documentation
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