ODE45 not working

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Hetune Manmohandas
Hetune Manmohandas on 10 May 2020
Edited: Hetune Manmohandas on 11 May 2020
Hey, im trying to solve a kinetic equation in function of the concentration and distance.
No matter the distance I place in txspan and L_reactor ( i changed from 0.5 to 100m), the ode return always the same concentration at the end of the reactor, when it should be calculating in function of the distance.
Can anyone help me?
solveD
  2 Comments
Star Strider
Star Strider on 11 May 2020
What is the result supposed to look like?
Do you have a reference plot?
Hetune Manmohandas
Hetune Manmohandas on 11 May 2020
just realised i have a wrong equation for the rho cataslyst, therefore nothing would work.
thanks, sorry for this

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Answers (1)

John D'Errico
John D'Errico on 11 May 2020
One must wonder if the reason a parameter NEVER changes, is if the derivative is always identically zero.
Then I look at the end of your code and see this:
dcdx(2) = 0;
So while I am not told what these differential equations are, I do see that one of them MUST result in a constant value, that never changes from the initial value.
I wonder... :)
  1 Comment
Hetune Manmohandas
Hetune Manmohandas on 11 May 2020
just realised i have a wrong equation for the rho cataslyst, therefore nothing would work.
thanks, sorry for this

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