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Mathematics Global ODEs and DAEs: How to port ODEs system from Mathcad?
Posted 22.06.2018, 19:03 GMT-4 Fluid & Heat, Studies & Solvers Version 5.2a 0 Replies
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Hi, I have the following system of ODEs in Mathcad:
It does solve well in Mathcad, however when I try to port it to COMSOL - the results are flat lines (equal to initial conditions).
Here is how I write the equations above in COMSOL using 0D 'Global ODEs and DAEs':
ro/(2*pi)*Stt*log(pi^0.5*lk/S^0.5)-p-ro/(8*pi*S)*St^2
1/(gamma-1)*pt-(N(t)-lk*gamma/(gamma-1)*p*St)/lk*S
Where N(t) - is lineary interpolated table function. Initial conditions: p(0) = 2000000, S(0)=1.5*10^-7, S'(0) = 0. The time range is: range(0, 1.0e-7, 4.4e-5).
Like I said above, the results are wrong (flat lines at the level of initial conditions).
Please advise what is wrong here. Maybe some issue with equations form, etc. Thank you.
Hello Alex Dox
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