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March 18, 2009, 12:02 |
Meteor Impact on atmosphere help!!!
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#1 |
New Member
Paul Shorrock
Join Date: Mar 2009
Posts: 1
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Hey
So I have a problem with a project I am doing A Meteor travelling at 20000m/s at 45deg AoA model this So i've been doing this for the past 6 months, starting from learning fluent and gambit to trying to get it to work. So far I managed to get it to travel at Mach 30 for about 3000 iterations at 0.1 courant number When I up the speed to Mach 72.25 which is the speed required the solution diverges quickly at under 900 iterations and doesnt produce contours which i require. This is at an altitude of 7km Conditions used are: Fluent 6.3 2ddp Materials - Air set as ideal gas Cp = 3157 (this was the advice of my tutor saying imagine gamma = 1.1) Operating conditions set to zero Boundary Conditions - Pressure Far Field (Atmosphere) Gauge Pressure = 41105 Pa Mach Number 72.25 Temp = 242.7K X Flow Direction 0.707106 Y Flow Direction 0.707106 Solution Controls Flow 2nd Order Upwind Courant Number 0.1 Flux Type - Roe-FDS and then I tried to iterate for 3000 but this diverged at 898 and crashed the program If anyone has any advice please let me know, I really have no idea what else to do! Thanks Paul |
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