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

Laser Heat Flux & UDF

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 3, 2004, 17:47
Default Laser Heat Flux & UDF
  #1
Dominick
Guest
 
Posts: n/a
Hi,

Does anyone of you ever tried to create a UDF for the heat flux of an incoming laser? (Like in laser processing and deposition)

If your laser is focused on a solid wall that is bordered by fluid zones, how can you input the UDF to the solid face since you can only do this if your faces (face01 and face01-shadow) are uncoupled (which then removes the link between the solid/fluid interface)?

I know how to program the UDF, but integrating it adequately seems a lot more complicated!!!

Thanks for the advice, Dominick
  Reply With Quote

Old   February 8, 2004, 08:48
Default Re: Laser Heat Flux & UDF
  #2
AE
Guest
 
Posts: n/a
Hi,

I once tried to solve a laser problem, i gave the laser power to the wall on the solid side and the uncoupled shadow face on the fluid side was adiabatic. I did not write a UDF. I did not have enough data to compare the results but they "somehow" looked reasonable. What is your opinion about such an approach?

Best AE
  Reply With Quote

Old   February 8, 2004, 19:10
Default Re: Laser Heat Flux & UDF
  #3
Dominick
Guest
 
Posts: n/a
Hi,

I actually did the same thing. I wrote a UDF consisting of the laser's Gaussian intensity profile which I applied to the solid-directed face as a non-constant heat flux. The fluid-directed face was put with a null heat flux (adiabatic).

The problem I have is that I obtain too-high temperature because (I think) the heat from the solid surface does not dissipate enough through the fluid since the face is considered adiabatic.

  Reply With Quote

Old   February 12, 2004, 16:46
Default Re: Laser Heat Flux & UDF
  #4
AE
Guest
 
Posts: n/a
I got too high temperatures too, but only in 2D. When I switched to 3D everything was OK. (i dont know the reason)

Regards

AE
  Reply With Quote

Reply


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
UDF code for arc as heat flux in simulation Alireza Kohandehghan Fluent UDF and Scheme Programming 5 April 18, 2019 11:18
CFX - wall heat flux divarano CFX 2 December 4, 2006 17:14
UDF for time dependent heat flux Rameshwar Ajja FLUENT 0 February 16, 2006 01:26
heat flux to heat rejection azmir Siemens 0 June 23, 2004 21:53
udf for transient heat flux BC isaac FLUENT 1 June 3, 2004 17:29


All times are GMT -4. The time now is 16:39.