
[Sponsors] 
April 6, 2013, 03:05 
Wrong figure in Hrv. thesis?

#1 
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 430
Rep Power: 15 
Hi there, a few days ago Dr. Axel Larreteguy told me about some concerns about Figure 3.7 in Hrv. thesis (see attachment). Here we have the vectors and , which have units of area and then vector , the correction, which seems to take in account the displacement of from the face centroid , so that it has units of distance. The concerns are:
1. Why the differences in units? 2. Do the vector decomposition make sense as is drawn? Below the figure it is stated that vector is not used 3. The correction vector is not used because simplification or because it is zero (I guess so)? Following the work of Mathur and Murthy http://www.tandfonline.com/doi/abs/1...915105#preview it leads to a zero correction. If it is the wrong interpretation 4. How do we interpret the figure? Thanks in advance,
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC)  CONICET/UNL Tel: 543424511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe  Argentina. http://www.cimec.org.ar 

April 6, 2013, 14:53 

#2  
Senior Member
Philip Cardiff
Join Date: Mar 2009
Location: Dublin,Ireland
Posts: 599
Rep Power: 20 
Quote:
Not sure if I can answer your questions, but In Hrv's thesis (and in OpenFOAM), nonorthogonal correction is not employed on the boundary. This assumption is fine if we assume that phi does not vary along the boundary. Although, if we assume that phi varies linearly along the boundary then nonorthgonal correction is required to maintain accuracy, as outlined in E. De Villiers thesis (Fig. 4.7). I believe that this correction is not performed in OpenFOAM because it may lead to mass flux across walls. But boundary nonorthogonal correction can be employed through use of custom boundary conditions, such as fixedDisplacement (corrected version of fixedValue) in the solidMechanics branch of OpenFOAM1.6ext. Hope it helped, Philip 

April 7, 2013, 01:37 

#3 
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 430
Rep Power: 15 
Thanks Philip, it helped! I'm going to elaborate some ideas to post.
Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC)  CONICET/UNL Tel: 543424511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe  Argentina. http://www.cimec.org.ar 

Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Urgent! how to plot contours without grid in the figure?  ivanbuz  FLUENT  11  November 10, 2009 22:44 
Abt: Schlieren figure in Tecplot using data  jinwon park  Tecplot  2  December 27, 2007 07:48 
Latex questiuon (figure)  John Dongarra  Main CFD Forum  5  August 22, 2007 10:06 
what's wrong about my code for 2d burgers equation  morxio  Main CFD Forum  3  April 27, 2007 10:38 
How can I post a figure on this forum?  ZHU  Main CFD Forum  3  June 21, 2000 22:22 