timestep calculation

akj · February 22, 2012, 23:50

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

xiandjf · February 23, 2012, 03:20

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

akj · February 23, 2012, 04:06

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, 06:39

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

niaz · February 23, 2012, 09:24

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, 00:52

let me try now if face problem then ask again

February 22, 2012, 23:50	timestep calculation	#1
akj New Member anil Join Date: Jun 2011 Location: chennai Posts: 20 Rep Power: 14	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

February 23, 2012, 06:39	hey friends	#4
amrik New Member amrik singh Join Date: Feb 2012 Posts: 16 Rep Power: 14	i want to know how to get the values of temperature with change in time in cfd or ansys cfx

February 24, 2012, 00:52	thanks niaz	#6
amrik New Member amrik singh Join Date: Feb 2012 Posts: 16 Rep Power: 14	let me try now if face problem then ask again

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February 23, 2012, 03:20		#2
xiandjf New Member Down Join Date: Dec 2011 Posts: 4 Rep Power: 14	timestep=Min Length/speed. Min Length is the minimum length of your mesh(sigle mesh)!

February 23, 2012, 04:06		#3
akj New Member anil Join Date: Jun 2011 Location: chennai Posts: 20 Rep Power: 14	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

February 23, 2012, 09:24		#5
niaz Senior Member A_R Join Date: Jun 2009 Posts: 122 Rep Power: 16	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)