Initial Velocity in Spray Modeling

safiullahs1 · May 10, 2019, 10:48

Hello,

I'm comparing diesel spray characteristics in AVL FIRE with experimental results but penetration length of my simulation is much shorter. But when I introduce initial velocity (labelled as Droplet "start velocity" in Nozzle section of SSF), penetration length of my CFD calculation becomes almost identical to experimental results. Is it a good idea to use start velocity? By the way, I input experimental measured injection rate (Zuech Method) in my calcuation.

Thanks.

steve lee · May 13, 2019, 03:04

Hi,
Usually, In spray simulation..
You should find break up model constants first..
and you have to consider delay time (it is very important)

May 10, 2019, 10:48	Initial Velocity in Spray Modeling	#1
safiullahs1 New Member Shaikh Join Date: May 2019 Posts: 1 Rep Power: 0	Hello, I'm comparing diesel spray characteristics in AVL FIRE with experimental results but penetration length of my simulation is much shorter. But when I introduce initial velocity (labelled as Droplet "start velocity" in Nozzle section of SSF), penetration length of my CFD calculation becomes almost identical to experimental results. Is it a good idea to use start velocity? By the way, I input experimental measured injection rate (Zuech Method) in my calcuation. Thanks.

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May 13, 2019, 03:04		#2
steve lee Member Steve Join Date: Mar 2018 Location: South Korea Posts: 69 Rep Power: 8	Hi, Usually, In spray simulation.. You should find break up model constants first.. and you have to consider delay time (it is very important)