fd0db67172
These functions are used by some of the examples, and show how custom reactor-like models can be implemented in Matlab. They are useful mostly as a basis for user modifications.
50 lines
1.2 KiB
Matlab
50 lines
1.2 KiB
Matlab
function dydt = reactor_ode(t,y,gas,vdot,area,heatflux)
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% REACTOR ODE system for a generic zero-dimensional reactor.
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%
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% Function REACTOR evaluates the system of ordinary differential
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% equations for a zero-dimensional reactor with arbitrary heat
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% transfer and volume change.
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%
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% Solution vector components:
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% y(1) Total internal energy U
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% y(2) Volume V
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% y(3) Mass of species 1
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% ....
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% y(2+nsp) Mass of last species
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%
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[m,n] = size(y);
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dydt = zeros(m,n);
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for j = 1:n
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this_y = y(:,j);
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int_energy = this_y(1);
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vol = this_y(2);
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masses = this_y(3:end);
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% evaluate the total mass, and the specific internal energy and volume.
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total_mass = sum(masses);
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u_mass = int_energy/total_mass;
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v_mass = vol/total_mass;
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% set the state of the gas by specifying (u,v,{Y_k})
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setMassFractions(gas,masses);
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setState_UV(gas, [u_mass v_mass]);
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p = pressure(gas);
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% volume equation
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vdt = feval(vdot, t, vol, gas);
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% energy equation
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a = feval(area, t, vol);
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q = feval(heatflux, t, gas);
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udt = -p * vdt + a * q;
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% species equations
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ydt = total_mass * ydot(gas);
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% set up column vector for dydt
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dydt(:,j) = [udt
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vdt
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ydt ];
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end
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