High Mach number fluent.

dsn2491 · February 15, 2012, 13:08

I am having problems in simulating M=2.8 flows in fluent. can someone tell me the general guidelines to follow while carrying out such high mach number calculations?

Thank you

dsn2491 · February 15, 2012, 13:23

i would be really thankful if someone helps...please help needed...urgent!!!

heidar · February 15, 2012, 15:12

hi
you shuold firstly use the compresible flow, you shuld be care about avoiding coarsening mesh in complicated curve flow which conduct the flow behaviour to enforce adverse pressure.

arungovindneelan · February 15, 2012, 22:33

You can get a good result in mach 2.8.
Make sure that your mesh is good.
Try to use fine mesh in shock area.
Use density base calculation
you can capture exact shock location with micron size mesh at the shock area!(otherwise you will get a thick shock)

dsn2491 · February 16, 2012, 12:16

i am performing a shock tube simulation to be specific and there seems to be some problem from the start of the calculation. the set values drop down to a vry low value.

courant number,mesh size or anything else that i need to take care of?

arungovindneelan · February 17, 2012, 10:59

Quote:

Originally Posted by dsn2491

i am performing a shock tube simulation to be specific and there seems to be some problem from the start of the calculation. the set values drop down to a vry low value.

courant number,mesh size or anything else that i need to take care of?

I haven't simulate a shock tube simulation. But i simulate a external flow supersonic simulation. I can't get your words. Please explain clearly.

February 15, 2012, 13:08	High Mach number fluent.	#1
dsn2491 New Member Aditya Join Date: Dec 2011 Posts: 28 Rep Power: 14	I am having problems in simulating M=2.8 flows in fluent. can someone tell me the general guidelines to follow while carrying out such high mach number calculations? Thank you

February 15, 2012, 15:12	comperesible flow	#3
heidar Member heidar jafarizadeh Join Date: Mar 2010 Location: Iran- Tehran Posts: 43 Rep Power: 16	hi you shuold firstly use the compresible flow, you shuld be care about avoiding coarsening mesh in complicated curve flow which conduct the flow behaviour to enforce adverse pressure. __________________ Best Regards Heidar Jafarizadeh

February 15, 2012, 22:33	mach 2.8	#4
arungovindneelan Member AGN Join Date: Dec 2011 Posts: 70 Rep Power: 14	You can get a good result in mach 2.8. Make sure that your mesh is good. Try to use fine mesh in shock area. Use density base calculation you can capture exact shock location with micron size mesh at the shock area!(otherwise you will get a thick shock)

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February 15, 2012, 13:23		#2
dsn2491 New Member Aditya Join Date: Dec 2011 Posts: 28 Rep Power: 14	i would be really thankful if someone helps...please help needed...urgent!!!

February 16, 2012, 12:16		#5
dsn2491 New Member Aditya Join Date: Dec 2011 Posts: 28 Rep Power: 14	i am performing a shock tube simulation to be specific and there seems to be some problem from the start of the calculation. the set values drop down to a vry low value. courant number,mesh size or anything else that i need to take care of?