hi evry one,

right now im workin with DPM in cyclone separator... I wanna calculate efficiency of cyclone.... how to do that in fluent? and how to get the no of particle at the outlets?( in post processing).

hi every one?

can any one explain me how to proceed in dpm in fluent... atleast the post processing?cus im strugglin to post process the no of particle at the outlet with which i can calculate cyclone effcinecy.

Write an UDF using DEFINE_DPM_BC macro.

In manual it says: "You can define a separate UDF (using DEFINE_DPM_BC) for each boundary."

So for each boundary you write a function which destroys particles that collide into it and increase counter for that boundary. Counter should be global and static, and therefore you should compile this UDF.

To get values of all counters write an EXECUTE_ON_DEMAND function which will read and print values of all counters, from which you can calculate the efficency of the cyclon.

Hope this idea helps.

thanks for your answer but could you give an example of a full udf for by example if you have have one inlet, one outlet for the flow and two different surface where particles are trapped. All the others surface being wall... i did that with fluent but i would like to use an udf but i dont have any experience with that. thank you

On the other hand Report -> Discrete Phase -> Sample can write out data you need in order to calculate the efficiency of your cyclone.

thank you sir,

i m trying to use the report -dp-sample...its writing a file bt... how to post process.. can u guide me further?.usin sample i ve written a file at outlet .should i open it as a word file?.. even when im tryin to see the histogram. the file is not read.... pls do help me..

[Manigandan.R]

i am searching the formula for pressure drop, velocity drop and dust collection efficiency in cyclone seperator