CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Injection/Droplet--urgent help needed THNX

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 11, 2010, 15:03
Angry Injection/Droplet--urgent help needed THNX
  #1
New Member
 
Shubham Bajpai
Join Date: Jan 2010
Posts: 12
Rep Power: 16
sbajpai is on a distinguished road
hello there,

I have a small question which i cant seem to figure out after looking at various tutorials.

I have designed a air plane cabin, need some help with some parts of simulation

3 rows of 3 chairs each. Small gap between chairs is also accounted for.

I have two inlets at top for airconditioner inlet (velocity inlet constant speed of 2m/s) I have two pressure outlet at the bottom at 0 gauge pressure.

I have one inlet at head level at one of the chairs. Now i need to create droplet or injection of particles at the inlet or at the point in the model.

it will be used to simulate a cough. Particles are inserted at a given speed at that level, could be anything, properties of the particles are NOT REQUIRED.

This is an unsteady problem calculated at 0.01 Time step (10 iterations per time step) and for 10 Secs totals.

I can do eeverything but i need to know how to introduce these particles.

1000 particles, droplets, which will be introduced in the cabin and see how they behave.

Gravity is -9.81 in Z direction, density, temperature ignored, pressure also not required.

I think this is very easy but i seem to be lost and confused.

IF ANYONE KNOWS HOW TO INTRODUCE PARTICLES/DROPLETS INTO A 3D DOMAINS THEN PLEASE WRITE BACK, ALL INFORMATION IS USEFULL

If you need additional informations please ask me i can provide that asap.

This is extremely important i am very tensed as i dont have much time, please help out if possible. Thank you

Best Regards,

Sbajpai
sbajpai is offline   Reply With Quote

Old   February 15, 2010, 15:55
Default dpm
  #2
Senior Member
 
CFDtoy
Join Date: Mar 2009
Location: United States
Posts: 145
Blog Entries: 2
Rep Power: 17
CFDtoy is on a distinguished road
hi,
use discrete particle modeling. Select a face or area where particleswill be injected. The mesh from gambit should have this face selection. Use this selection in fluent multiphase modeling - discrete particle assumption of finite diameter.

What you are performing right now is an aerosol calculation. DPM works fine for this sparse spray assumption.

Just make sure you do good numerics to compute the flow (like check Re and use higher order RSM models for turbulence effects etc) this is becauase, the particles travel with the predicted flow field and as long as your flow field is good(read great), the particle distribution and their trajectory will be fantastic !!

Good luck.

CFDtoy

Quote:
Originally Posted by sbajpai View Post
hello there,

I have a small question which i cant seem to figure out after looking at various tutorials.

I have designed a air plane cabin, need some help with some parts of simulation

3 rows of 3 chairs each. Small gap between chairs is also accounted for.

I have two inlets at top for airconditioner inlet (velocity inlet constant speed of 2m/s) I have two pressure outlet at the bottom at 0 gauge pressure.

I have one inlet at head level at one of the chairs. Now i need to create droplet or injection of particles at the inlet or at the point in the model.

it will be used to simulate a cough. Particles are inserted at a given speed at that level, could be anything, properties of the particles are NOT REQUIRED.

This is an unsteady problem calculated at 0.01 Time step (10 iterations per time step) and for 10 Secs totals.

I can do eeverything but i need to know how to introduce these particles.

1000 particles, droplets, which will be introduced in the cabin and see how they behave.

Gravity is -9.81 in Z direction, density, temperature ignored, pressure also not required.

I think this is very easy but i seem to be lost and confused.

IF ANYONE KNOWS HOW TO INTRODUCE PARTICLES/DROPLETS INTO A 3D DOMAINS THEN PLEASE WRITE BACK, ALL INFORMATION IS USEFULL

If you need additional informations please ask me i can provide that asap.

This is extremely important i am very tensed as i dont have much time, please help out if possible. Thank you

Best Regards,

Sbajpai
__________________
CFDtoy
CFDtoy is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cell/nodes needed for CHT (Urgent) tengra FLUENT 6 April 24, 2009 17:22
help needed in Turbulent flow (URGENT) mike FLUENT 7 November 7, 2008 07:11
Urgent help needed with spray injection nick Siemens 14 June 29, 2008 19:48
Urgent Help Needed! Ken Adams FLUENT 3 September 26, 2007 00:50
Urgent help needed in finding maximum temperature. Deadly FLUENT 3 September 3, 2002 09:43


All times are GMT -4. The time now is 08:20.