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A general interface question about two phasing simulation using CONVERGE

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Old   October 17, 2017, 15:22
Default A general interface question about two phasing simulation using CONVERGE
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tmy
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Mingyuan Tao
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Hi guys,

Recently I started to use Converge, and there are two problems confusing me as listed below:

1. If I want to simulate a two-phase problem, say fuel injection case. I find that the calculation of phase interface is always based on some models (atomization, vaporization). Is it possible to use DNS for the calculation of interface? For example, the calculation of droplet size change due to mass transfer between liquid and gas phase? Do we have to import the governing equations by using user-defined functions?

2. Is CONVERGE specifically designed for engine simulation? It is powerful to simulate fuel injection case, in which fuel spray is moving inside engine chamber. What if I want to simulate a stationary droplet? I find that if I want to introduce liquid phase into simulation (adding spray model in Physical model), then CONVERGE STUDIO would ask me to set the injectors, but for a stationary liquid droplet I do not need any injectors. Can I fix this problem by directly changing some settings in Converge Studio? Or do I need to use user-defined function to achieve such simulation?

I would really appreciate if someone could solve or explain these problems. Thanks!

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Old   November 7, 2017, 16:54
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Tristan Burton
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Mingyuan,

We have done stationary droplet calculations as part of our aftertreatment validation test suite. Basically, you use a spray_map.dat to place a single droplet and then use the spray models to govern the behavior moving forward in time (without actually injecting anything).

Best regards,

Tristan
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