# Boundary conditions in dieselFoam

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

 July 7, 2011, 09:52 Boundary conditions in dieselFoam #1 New Member   Noureddine TAGUELMIMT Join Date: Mar 2011 Location: Rouen, France Posts: 21 Rep Power: 6 Hii, I'm trying to simulate a flash boiling jet of propane in atmosphere with dieselFoam, my geometry is a cylinder of 600*D long and 100*D diameter where D is the diameter of the nozzle. i added a C3H8 file in 0 directory to inject a propane gas, so i have borh gas phase and liquide phase of propane. the boundary conditions are atmospheric, so i've ambient temperature in the domaine and at the boundaries, also a 233 K for both the gas phase and liquid for the propane, but i don't know what are the condition for the turbulence properties (k, Epsilon, alphat, mut) and yf, yu, Ydefault. velocity of injector: 52 m/s velocity of gas phase C3H8: 49.304 T ambient: 298 T C3H8 (both gas and liquid phase): 233 K The screen below shows better my case: U.jpg C3H8.jpg T.jpg injectorProperties.jpg epsilon.jpg If you have an idea in what can be the correct and realistic boundary conditions related to the my case I would be very grateful. Noureddine. Thank you.

 January 20, 2012, 12:28 #2 New Member   Join Date: Jan 2012 Posts: 23 Rep Power: 5 Hi Noureddine, I am sorry i dont have an answer for your question as i am very new to openFoam as well as cfd in general. But, i do have a question to ask. I am trying to solve the aachenbomb case with my own geometry as you have done. I dont know how to give the position of my injector in the new geometry to openfoam. I cannot share the geometry but it is something like the good old time telephone reciever with an injector at the place where one holds the reciever i.e. on the bend (sorry, this is the best i can describe the geometry ). The injector is at an angle (I hope you are getting an idea what it looks like by this description) . It would be great to get some help from you. Regards Abhinay

 January 20, 2012, 13:58 #3 Senior Member     Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 725 Rep Power: 18 Look for a keyword called position in the constant/injectorProperties file if you are using dieselFoam. There is also a keyword named direction that give the orientation of the injector.

 January 23, 2012, 09:55 #4 New Member   Join Date: Jan 2012 Posts: 23 Rep Power: 5 Hi, I do know about the injectorprpoerties file. But my question is regarding how can i give the position of my injector in my new geometrry?? The key words position and direction are defined already according to the aachenbomb tutorial. I hope i have made my question clear Thank you Regards Abhinay

 January 23, 2012, 13:10 #5 Senior Member     Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 725 Rep Power: 18 The position is based on the global coordinate system of your mesh. The easiest way to see is to open your mesh in ParaFoam and create a point source where you want your injector to be located and then copy the coordinates to the injectorProperties file. The direction vector is normalized, so don't worry about the magnitude, just get the direction right.

 January 24, 2012, 07:20 #6 New Member   Join Date: Jan 2012 Posts: 23 Rep Power: 5 Thanks you for your help. I managed to solve my problem!!

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post lost.identity CFX 41 May 22, 2013 07:21 Anindya Main CFD Forum 24 January 11, 2012 14:40 NickolasPl OpenFOAM Programming & Development 2 May 19, 2011 05:37 vaina74 Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 May 27, 2010 09:38 michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 10:37.