Initial Velocity in Spray Modeling

safiullahs1 · May 10, 2019, 11:48

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, 04:04

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, 11:48	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Maximum number of iterations exceeded chtmultiregionsimpleFoam	Moncef	OpenFOAM Running, Solving & CFD	28	July 13, 2020 15:26
pressure in incompressible solvers e.g. simpleFoam	chrizzl	OpenFOAM Running, Solving & CFD	13	March 28, 2017 06:49
High Courant Number @ icoFoam	Artex85	OpenFOAM Running, Solving & CFD	11	February 16, 2017 14:40
Unstabil Simulation with chtMultiRegionFoam	mbay101	OpenFOAM Running, Solving & CFD	13	December 28, 2013 14:12
pimpleFoam: turbulence->correct(); is not executed when using residualControl	hfs	OpenFOAM Running, Solving & CFD	3	October 29, 2013 09:35

May 13, 2019, 04:04		#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)