Axisymmetric flow over boat-tail of payload fairing

Mohit Singh · January 24, 2016, 14:04

Hello everyone,
I tried to simulate an axisymmetric flow over the boat-tail of a payload fairing in SU 2 (version 3.2.8), I got caught up in a problem that the solution diverges as i run the simulation. Can anybody help me to find out the reason for that so as to rectify it. Any kind of help is appreciated. For your reference, I tried to attach the .cfg file but got a message of upload error (saying invalid file), for which I don't know the reason. The interested person can give his/her email so that I could send the file by mail.
I know it may sound silly but just out of curiosity, I would like to ask how could one customize the .cfg file (what i mean by that is, I am getting certain output parameters on running a particular simulation so how can I modify the .cfg file to get parameters of my interest as output along with what it usually returns) i.e, the surface solution file do not contain distribution of shear stress on the surface so what changes i have to make and where (if possible) in the configuration file.

talbring · January 26, 2016, 05:42

Hi mohit,

the surface file contains the skin friction coefficient, which is essentially the non-dimensional wall shear stress (shear-stress divided by dynamic pressure of the free-stream).

Regarding your first question: we can only give you hints as the reasons for non-convergence are manifold. But since I am not an expert on this topic I would leave this question open.

Mohit Singh · January 26, 2016, 16:13

Hi talbring,
First of all thanks for your concern and thanks for pointing out the way to get shear stress distribution from the output. However, what I thought was, can we make some changes somewhere in the source file so as to directly get the desired parameter(shear stress, in this case) evaluated in the output. Nevertheless, I thank you once again for your help.

January 24, 2016, 14:04	Axisymmetric flow over boat-tail of payload fairing	#1
Mohit Singh New Member mohit Join Date: Jun 2015 Location: Trivandrum Posts: 13 Rep Power: 11	Hello everyone, I tried to simulate an axisymmetric flow over the boat-tail of a payload fairing in SU 2 (version 3.2.8), I got caught up in a problem that the solution diverges as i run the simulation. Can anybody help me to find out the reason for that so as to rectify it. Any kind of help is appreciated. For your reference, I tried to attach the .cfg file but got a message of upload error (saying invalid file), for which I don't know the reason. The interested person can give his/her email so that I could send the file by mail. I know it may sound silly but just out of curiosity, I would like to ask how could one customize the .cfg file (what i mean by that is, I am getting certain output parameters on running a particular simulation so how can I modify the .cfg file to get parameters of my interest as output along with what it usually returns) i.e, the surface solution file do not contain distribution of shear stress on the surface so what changes i have to make and where (if possible) in the configuration file.

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January 26, 2016, 05:42		#2
talbring Super Moderator Tim Albring Join Date: Sep 2015 Posts: 195 Rep Power: 11	Hi mohit, the surface file contains the skin friction coefficient, which is essentially the non-dimensional wall shear stress (shear-stress divided by dynamic pressure of the free-stream). Regarding your first question: we can only give you hints as the reasons for non-convergence are manifold. But since I am not an expert on this topic I would leave this question open.

January 26, 2016, 16:13		#3
Mohit Singh New Member mohit Join Date: Jun 2015 Location: Trivandrum Posts: 13 Rep Power: 11	Hi talbring, First of all thanks for your concern and thanks for pointing out the way to get shear stress distribution from the output. However, what I thought was, can we make some changes somewhere in the source file so as to directly get the desired parameter(shear stress, in this case) evaluated in the output. Nevertheless, I thank you once again for your help.