# UDF to simulate liquid with certain frequecy vibration

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 April 6, 2019, 01:25 UDF to simulate liquid with certain frequecy vibration #1 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 Hello, I need UDF to simulate liquid in container, having liquid at bottom with certain frequency to create a droplet clouds. please share some ideas to build UDF. considered liquid is kerosene and I'm working In fluent.

 April 11, 2019, 12:17 #2 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 anyone please...how to simulate a liquid with frequency value in fluent

 April 12, 2019, 00:29 #3 Senior Member   Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34 frequency of what? best regards

 April 12, 2019, 02:04 #4 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 Thank you for your response, Frequency of ultrasonic transducer, Its an experimental work,where kerosene at bottom of the chamber and with the help of ultrasonic transducer it provide 24MHz to simulate that liquid ,by that it forms droplet clouds. Now I dont know how to approach that same thing in fluent.. please help me. Thanks

 April 13, 2019, 04:10 #5 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 I found some equation... anyone please help me how to write udf for this Pu = Pa cos {w(t+ z/c)} where Pa = root 2I row c I= Pus / A Pa- amplitude of sound pressure w(omega)- 2 pi f angular freq t time z space coordinates c sound speed in water f frequency I sound intensity Pus ultrasonic power A ultrasonic transducer area. please help me with this

 April 18, 2019, 05:38 #6 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 Anyone pls... im stuck here.. hope someone will help me with this.

 April 18, 2019, 20:37 #7 Senior Member   Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34 the problem is how are you going to simulate this, are you going to use DPM? equations and UDF is not a problem I suggest you to move this thread to FLUENT branch (not Fluent UDF) best regards

 April 18, 2019, 23:32 #8 Member   samm Join Date: Feb 2019 Location: South Korea Posts: 39 Rep Power: 7 Thank you so much for your response.. yes im going to use DPM... after that how can I approach..? ill move this thread as per your advice. Thanks, Jegan.

 Tags frequency, kerosene, udf, ultrasonic transducer