1D solution of shock tube

immortality · May 30, 2013, 11:08

Hi
shock tube is a basic CFD problem for testing systems with discontinuities.
its valuable that provide a analytic program for 1D inviscid shock tube that gives flow properties at each sections whenever the user wants,in any form like a Matlab program or what form that anyone interested thinks its good is worthy.

kaushik.kiit · June 18, 2013, 07:24

I have run the shock tube problem for various schemes and I found that when the CFL number is reduced, the error increases...can you explain why??

BTW the analytical solution of shock tube is attached here

immortality · June 18, 2013, 07:36

thats a valuable work.could you add some explanations in different parts?
you compare error with what?

kaushik.kiit · June 18, 2013, 07:45

I have found the error in pressure and density by evaluating the diiference between the numerical solution and the exact solution and I have carried out the process for two values of CFL no, 0.5 and 0.1. The errors associated with CFL 0.1 are larger than CFL 0.5 and I would like to know why....

immortality · June 18, 2013, 07:57

why this error occurs?

Code:

ehsan@Ehsan-com:~/Desktop$ gcc analytical_WR.c -o WR
analytical_WR.c:4:18: fatal error: conio.h: No such file or directory
compilation terminated.

immortality · June 27, 2013, 10:01

what does errors mean?and how to resolve?
can anyone help?

chegdan · June 27, 2013, 10:47

Added the stdlib.h header and compiled it correctly with

Code:

gcc -o output ShockTube.CPP -lm

Run code with

Code:

./output

immortality · June 27, 2013, 12:25

Thanks and whats the problem with this file?could you have a look into it?

chegdan · June 27, 2013, 13:25

Did you try to Google the error?

Code:

gcc -o output shockTube2.CPP -lm
shockTube2.CPP:4:18: fatal error: conio.h: No such file or directory
compilation terminated.

here is a link to what i found.

May 30, 2013, 11:08	1D solution of shock tube	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	Hi shock tube is a basic CFD problem for testing systems with discontinuities. its valuable that provide a analytic program for 1D inviscid shock tube that gives flow properties at each sections whenever the user wants,in any form like a Matlab program or what form that anyone interested thinks its good is worthy. Saikat_FM likes this. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 18, 2013, 07:36		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	thats a valuable work.could you add some explanations in different parts? you compare error with what? __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 18, 2013, 07:57		#5
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	why this error occurs? Code: ehsan@Ehsan-com:~/Desktop$ gcc analytical_WR.c -o WR analytical_WR.c:4:18: fatal error: conio.h: No such file or directory compilation terminated. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 27, 2013, 13:25		#9
chegdan Senior Member Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 621 Rep Power: 0	Did you try to Google the error? Code: gcc -o output shockTube2.CPP -lm shockTube2.CPP:4:18: fatal error: conio.h: No such file or directory compilation terminated. here is a link to what i found.

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June 18, 2013, 07:45		#4
kaushik.kiit New Member Kaushik Roy Join Date: Jun 2013 Posts: 2 Rep Power: 0	I have found the error in pressure and density by evaluating the diiference between the numerical solution and the exact solution and I have carried out the process for two values of CFL no, 0.5 and 0.1. The errors associated with CFL 0.1 are larger than CFL 0.5 and I would like to know why....