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akj February 23, 2012 00:50

timestep calculation
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

any help will be appriciated,


Anil jaswal

xiandjf February 23, 2012 04:20

timestep=Min Length/speed. Min Length is the minimum length of your mesh(sigle mesh)!

akj February 23, 2012 05:06

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

amrik February 23, 2012 07:39

hey friends
i want to know how to get the values of temperature with change in time in cfd or ansys cfx

niaz February 23, 2012 10:24

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)

amrik February 24, 2012 01:52

thanks niaz
let me try now if face problem then ask again

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