# Fluent data structure and geometry

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

 April 21, 2003, 10:18 Fluent data structure and geometry #1 Steven Guest   Posts: n/a Hi, All, Sometimes, I felt myself really by those data types like cell,face,thread,domain,etc when writing UDFs. I do not think Fluent UDF manual gives sufficient information and guide on this topic. For example, I would like to apply 3 different values for the diffusivity over 3 different zones. I got a kind help for Murali, and I wrote the attached code based on his suggestion. However, this code gives me problem, it cannot go over all the regions and distribute values respectively. It just gave me the same value for all the three zones. Anyone can help me out? Also, is there any source that I can get some more information on how to conduct the calculation or define properties over zones,faces,cells? The manual looks very simple and not systematic on this. Thanks in advance. DEFINE_DIFFUSIVITY(my_diff,c,t,i) { int zone_id; Thread *c_thread; Domain *dom; real D; Get_Domain(dom); /*Obtain the zone id of the face*/ for (i=2;i<=4;i++) { if (c_thread==Lookup_Thread(dom,i)) { zone_id=i; } switch (zone_id) { case 2: D=2; break; case 3: D=3; break; case 4: D=4; break; } return D; } }

 April 21, 2003, 13:43 Re: Fluent data structure and geometry #2 Alex Munoz Guest   Posts: n/a Hi Careful In fluent you must to use "." for real number example you write D=3; you must write D=3.0; or D=3.; The other problems you must to write several examples to understand how to write a good UDF Best regards Alex

 April 22, 2003, 11:25 Re: Fluent data structure and geometry #3 Steven Guest   Posts: n/a Thanks, Alex. I just wanted to give a simple example, but made a mistake there. Actually, I have some experience with Fluent UDF, but I think the manual does not give sufficient guide in applying different properties or math equations to different regions. Any hint on this. Thank you. Steven

 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 Fransje OpenFOAM 2 January 23, 2014 01:13 capucsc OpenFOAM 4 May 6, 2011 11:26 user Main CFD Forum 6 November 25, 2010 02:14 Mark FLUENT 2 October 4, 2006 05:36 Sujit FLUENT 2 August 18, 2003 17:17

All times are GMT -4. The time now is 19:36.