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
rpm=1800

any help will be appriciated,

Regard,

Anil jaswal

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

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

hey friends
 

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

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)

thanks niaz
 

let me try now if face problem then ask again