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OpenMDAO / pyCycle

Thermodynamic cycle modeling library, built on top of OpenMDAO
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Issues related to MAP correction of off-design points #63

Open NJC1012 opened 1 month ago

NJC1012 commented 1 month ago

Dear scholar! When I matched the design points of a high bypass ratio engine model with 0 Mach and 0 altitude, it was difficult to perform off-design point calculations. Firstly, how to perform off-design point calculations, especially the scaling and correction of MAP, was not seen in the relevant examples. Secondly, when I try to perform off-design point calculations, it is easy to encounter "SolverWarning: 'case1. duct13. out_stat. base_thermo. chem_eq. n' exceptions lower bounds". And "RuntimeWarning: invalid value encoded in sqrt"and"Vsonic=(i ['gamma '] i ['R'] i ['Ts']) 0.5", may I know how to handle it? Is it due to a problem with the component map? I urgently need your help. Thank you to the kind person and wish you good luck.

arushkumarsingh commented 1 month ago

Hi NJC, For map correction, u can read: https://ntrs.nasa.gov/api/citations/20070018165/downloads/20070018165.pdf For solver convergence, you can read: https://openmdao.github.io/PracticalMDO/Notebooks/Homeworks/Problems/debug_solvers.html

Basically, by changing the initial value for the off-design condition, the code wouldn't throw any warning. But for some very odd off-design conditions, i.e if you are running at the edges of the maps, the solver will again throw out warnings.

I am also working on this code, can we connect? Thanks!

NJC1012 commented 1 month ago

Hi NJC, For map correction, u can read: https://ntrs.nasa.gov/api/citations/20070018165/downloads/20070018165.pdf For solver convergence, you can read: https://openmdao.github.io/PracticalMDO/Notebooks/Homeworks/Problems/debug_solvers.html

Basically, by changing the initial value for the off-design condition, the code wouldn't throw any warning. But for some very odd off-design conditions, i.e if you are running at the edges of the maps, the solver will again throw out warnings.

I am also working on this code, can we connect? Thanks!

Thank you for your help. I'd be happy to connect,My contact details are"2073812034@qq.com"，If it's inconvenient, you can also provide your connect information.TAHNKS!

NJC1012 commented 1 month ago

Thank you for your help. I'd be happy to connect,My contact details are"[2073812034@qq.com].If it's inconvenient, you can also provide your connect information. Looking forward to your reply. TAHNKS!