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Old   February 23, 2012, 00:50
Default timestep calculation
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akj
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dear frns i am doing a cfd analysis for vaneless diffuser in unsteady flow. i want to know in that how we will claculate the timestep, what should be the maximum timestep.

inlet diameter =180mm
oulet dia.=550mm
rpm=1800

any help will be appriciated,

Regard,

Anil jaswal
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Old   February 23, 2012, 04:20
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timestep=Min Length/speed. Min Length is the minimum length of your mesh(sigle mesh)!
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Old   February 23, 2012, 05:06
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dear xiandjf

thnx for u r reply but can u plz elaborate n hw can we calculate the minimum leght of the mesh size....

regards ,

anil jaswal
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Old   February 23, 2012, 07:39
Default hey friends
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i want to know how to get the values of temperature with change in time in cfd or ansys cfx
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Old   February 23, 2012, 10:24
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Dear xian
if you use specific soft such as fluent you can find it while you use checkmesh. else you wrote a code, add a function to caclulate min area of each cell( it is easy in all language)
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Old   February 24, 2012, 01:52
Default thanks niaz
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let me try now if face problem then ask again
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