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Filtra

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Subsonic Ramjet Model

Posted 26 nov 2012, 17:41 GMT-5 Chemical Reaction Engineering Version 4.4 2 Replies

Collin Grimes
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I am attempting to optimize the design of a ramjet to be created for rocket experimentation. I have been working on the model for the fall semester attempting to refine it. I am now using a 2d axis symmetric turbulent flow and heat transfer models. The heat transfer is being used as a rough model for combustion. I could get the model to converge before I realized the heat transfer model and turbulent flow model were not coupled. But once I coupled them the model will only converge sporadically for very coarse meshes. Could you help me figure out how to get the model to converge? Any tuning that could be done to make the model more accurate would be very helpful as well.

The model beginning with "test coupling" has the two models coupled (at least I think) but will not converge.
2 Replies Last Post 3 feb 2015, 23:32 GMT-5
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Hello Collin Grimes

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Fabrice Schlegel COMSOL Employee

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Posted: 1 decade ago 25 gen 2013, 10:27 GMT-5
Hi Collin,

The resolution of this model will require the High Mach Number Flow interface, as done in the Sajben diffuser model in the model library.
Hi Collin, The resolution of this model will require the High Mach Number Flow interface, as done in the Sajben diffuser model in the model library.
Kate
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Posted: 10 years ago 3 feb 2015, 23:32 GMT-5
Hi, Fabrice Schlegel,
Would you please give me any advice on my COMSOL simulation on steady state 1-D premixed laminar combustion of hydrogen in a cylinder with specific diameter with temperature-dependent thermodynamic and transport properties to get the space-dependent temperature and concentration profile？ I want to use the temperature-dependent thermodynamic and transport properties , so I developed Model 1 but I did not get any result because of an error which I do not know how to solve. Would you please help me with this ?
I really appreciate your help.
Best,
Kate
Hi, Fabrice Schlegel, Would you please give me any advice on my COMSOL simulation on steady state 1-D premixed laminar combustion of hydrogen in a cylinder with specific diameter with temperature-dependent thermodynamic and transport properties to get the space-dependent temperature and concentration profile？ I want to use the temperature-dependent thermodynamic and transport properties , so I developed Model 1 but I did not get any result because of an error which I do not know how to solve. Would you please help me with this ? I really appreciate your help. Best, Kate

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