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UDF for splashed mass in impinging sprays

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Old   February 23, 2021, 12:05
Default UDF for splashed mass in impinging sprays
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Christoph
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Hi Community,

I am modeling an impinging spray. I have added a UDF for the splashed mass (see attachment). However, the simulation crashes every time when the spray impacts the surface.

Now I have two questions:
1) Did I do something wrong in the spray_mass.c?
2) Or do I need to define film_splash.c too?

It is the first time, I am using a UDF, and I am inexperienced with that. So I would be happy about any hint you could give me. Thank you!

Christoph
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Old   February 23, 2021, 17:19
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Kislaya Srivastava
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Hello Christoph,

You have altered the IN macro list to include passed_splash_var as a VALUE variable (not advised). splash_var (splash energy/weber no.) is not included within the list of CONVERGE variables being passed to the splash_mass.c UDF and hence is not available. Your log file should state an error resolving "passed_splash_var" as an argument. It is only available within splash_crit.c and splash_radius.c. Users are advised to not include passed_* variables from one UDF to different UDFs. Different UDFs have different variables being passed onto them.

We'd be happy to develop a working UDF for you to offer what you seek. Please contact support@convergecfd.com . Please use your official email for all correspondence with Convergent Science. Please mention the your UDF request, attach a case setup (if possible) and add my name, and the cfd-online thread, as reference.


Sincerely,
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Old   February 23, 2021, 17:54
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Kislaya Srivastava
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Hello Christoph,

To add to my previous comment, and since you pointed it out yourself, you can achieve what you're looking for by relying on film_splash.c, instead of splash_mass.c. Within film_splash.c, uncomment the film splash model routine (user_film_splash_*) you require and modify the splashed mass (rmsplash) calculation.

Hope this helps.

Sincerely,
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