need help on simulating flow over a cylinder

beehuah · November 23, 2010, 02:38

hi all,
need some advise and suggestion to start of for a project on flow over a bundle of circular cylinder. I'm using air as the working fluid with low reynolds number to get the nusselt number around the circular cylinder. Anyone can suggest me on the steps to start it.

thanks

swamysrikanth · November 23, 2010, 04:05

first of all, fix ur domain for ur simulation. that means cylinders position, alignment and so on. later try to make the fine mesh around the cylinders and some distance away from it in downstream zone to capture the flow.
then set up the case. run the simulation. compare the Cd and Nu with literature values.
before procedding do some literature survey it will give u a clear idea.

pradeap · November 23, 2010, 08:17

Is that Nu means Nusselt number...
i think you need to compare with the Strohals number along with the Cd

swamysrikanth · November 24, 2010, 04:19

yes it means Nusselt number.
you can compare Strouhal no. also with literature values

beehuah · November 24, 2010, 08:37

hi swamysrikanth

i have tried to simulate the bundle of circular cylinder with reynolds number of 100 but i got the Nu of 350 at the stagnation point of the cylinder. which is not reasonable.may i know whats the problem.

November 23, 2010, 02:38	need help on simulating flow over a cylinder	#1
beehuah New Member Join Date: Nov 2010 Posts: 8 Rep Power: 15	hi all, need some advise and suggestion to start of for a project on flow over a bundle of circular cylinder. I'm using air as the working fluid with low reynolds number to get the nusselt number around the circular cylinder. Anyone can suggest me on the steps to start it. thanks

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November 23, 2010, 04:05		#2
swamysrikanth New Member srikanth Join Date: Nov 2009 Posts: 22 Rep Power: 16	first of all, fix ur domain for ur simulation. that means cylinders position, alignment and so on. later try to make the fine mesh around the cylinders and some distance away from it in downstream zone to capture the flow. then set up the case. run the simulation. compare the Cd and Nu with literature values. before procedding do some literature survey it will give u a clear idea.

November 23, 2010, 08:17		#3
pradeap New Member kumar Join Date: Jun 2010 Posts: 20 Rep Power: 16	Is that Nu means Nusselt number... i think you need to compare with the Strohals number along with the Cd

November 24, 2010, 04:19		#4
swamysrikanth New Member srikanth Join Date: Nov 2009 Posts: 22 Rep Power: 16	yes it means Nusselt number. you can compare Strouhal no. also with literature values

November 24, 2010, 08:37		#5
beehuah New Member Join Date: Nov 2010 Posts: 8 Rep Power: 15	hi swamysrikanth i have tried to simulate the bundle of circular cylinder with reynolds number of 100 but i got the Nu of 350 at the stagnation point of the cylinder. which is not reasonable.may i know whats the problem.