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Hey, guys!
There is a tutorial called "Modeling bubbling fluidized bed using DDPM+DEM" available in Customer Support portal. In this tutorial a fluidized bed containing about 90 thousand particles is modeled. Particles are injected by means of an injection file from 0 to 1e-08 seconds. Here is a part of their file: ((-0.098104 0.007238 -0.198122 0.0 0.0 0.0 0.000750 300.000000 4347.826018) injection:0) Why does the mass flow rate equals 4347.826018 kg/s???(for all particles) How was it calculated? Judging from what I've read on the CFD forum, the mass flow rate of a single particle is the particle mass divided by the injection time, right? However, assuming that density equals 1600 kg/m3, the mass is 3.534e-07 kg and time is 1e-08 seconds, the mass flowrate finally equals 35.34 kg/s (123 times less than their). Please, help us sort it out. You reply is extremely welcome!Attachment 44078 |
Hello @HeatPro, did you get to know how the mass flow rate was calculated? I would appreciate your response. Thank you.
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can anyone helpme out here. io have tried to atch the following file for injection as .inj file. but it is not working
(( x y z u v w diameter temperature mass-flow ) name ) (( 30 0 -140.98 0 0 31.678 0.25 288 0.5 ) 1 ) (( 28.97777479 7.764571353 -140.98 0 0 31.678 0.25 288 0.5 ) 2 ) (( 25.98076211 15 -140.98 0 0 31.678 0.25 288 0.5 ) 3 ) (( 21.21320344 21.21320344 -140.98 0 0 31.678 0.25 288 0.5 ) 4 ) (( 15 25.98076211 -140.98 0 0 31.678 0.25 288 0.5 ) 5 ) (( 7.764571353 28.97777479 -140.98 0 0 31.678 0.25 288 0.5 ) 6 ) (( 1.83772E-15 30 -140.98 0 0 31.678 0.25 288 0.5 ) 7 ) (( -7.764571353 28.97777479 -140.98 0 0 31.678 0.25 288 0.5 ) 8 ) (( -15 25.98076211 -140.98 0 0 31.678 0.25 288 0.5 ) 9 ) (( -21.21320344 21.21320344 -140.98 0 0 31.678 0.25 288 0.5 ) 10 ) (( -25.98076211 15 -140.98 0 0 31.678 0.25 288 0.5 ) 11 ) (( -28.97777479 7.764571353 -140.98 0 0 31.678 0.25 288 0.5 ) 12 ) (( -30 3.67545E-15 -140.98 0 0 31.678 0.25 288 0.5 ) 13 ) (( -28.97777479 -7.764571353 -140.98 0 0 31.678 0.25 288 0.5 ) 14 ) (( -25.98076211 -15 -140.98 0 0 31.678 0.25 288 0.5 ) 15 ) (( -21.21320344 -21.21320344 -140.98 0 0 31.678 0.25 288 0.5 ) 16 ) (( -15 -25.98076211 -140.98 0 0 31.678 0.25 288 0.5 ) 17 ) (( -7.764571353 -28.97777479 -140.98 0 0 31.678 0.25 288 0.5 ) 18 ) (( -5.51317E-15 -30 -140.98 0 0 31.678 0.25 288 0.5 ) 19 ) (( 7.764571353 -28.97777479 -140.98 0 0 31.678 0.25 288 0.5 ) 20 ) (( 15 -25.98076211 -140.98 0 0 31.678 0.25 288 0.5 ) 21 ) (( 21.21320344 -21.21320344 -140.98 0 0 31.678 0.25 288 0.5 ) 22 ) (( 25.98076211 -15 -140.98 0 0 31.678 0.25 288 0.5 ) 23 ) (( 28.97777479 -7.764571353 -140.98 0 0 31.678 0.25 288 0.5 ) 24 ) (( 30 -7.35089E-15 -140.98 0 0 31.678 0.25 288 0.5 ) 25 ) |
I was also having problems with Fluent not reading my .inj, despite my formatting seeming correct.
What I found out was that I was saving the .inj using Unicode encoding in Windows Notepad. After I changed to ANSI encoding, it worked! |
Hello, sorry for my poor English. You will understand all by checking "Report→Summary" in Fluent. I hope it can help you.
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please can you send to me the injection file 92Kparcels.inj
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Here it is: Code:
https://www2.zippyshare.com/v/ukUfURSA/file.html |
thanks alot
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IC engine combustion simulation
In IC engine combustion simulation an injection mass profile is needed but as I'm new to fluent i don't know how to create and proceed. Your kind help will greatly be appreciated.
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Trouble with injection file in Ansys fluent?
I am using Eulerien dense discrete phase model in Ansys Fluent for modeling diesel spray in a constant volume chamber. In fluent injection, particle initial conditions can be read from an external file. I write six injections in a one file, the file has the following form:
((x y z u v w diameter temperature mass-flow) injection0:ID) When I run the simulation it give the error “ERROR reading particle 0 for injection: injection-0” Can anybody suggest me the solution to this problem? Thanks in advance. |
Pls, can someone send me the 92Kparcels.in file.
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Injection File
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Hi
Excuse me, is it possible to simulate a nanofluid (zero velocity) using the Discrete Phase Model(DPM) at Ansys Fluent? Could you please help me? When the Nanofluid enteres the tube at a certain velocity, I can inject the particle into the tube as <surface> and take its velocity equal to the velocity of the base fluid, and simulation will occur. But at zero Velocity i dont know how to inject the particles Regards |
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i want to ask if i want to describe a static powder particles in a powder bed, how much i have to set the powder particles mass flow rate (kg/s)?? thanks |
hi, thanks for your explanations and code also,
I have a question, instead of 2 particles if I want to inject 10000 particles at different positions how can I select random positions? in this case, how can I write my file? thanks |
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