Literature to validate Flow over Cylinder

RealENG22 · March 25, 2013, 13:49

All,

Does anyone have anyone have any good sources/links to literature (preferably numerical/experiemental) which I could compare by creating my own CFD in Ansys Fluent. I found one from WASET but I am worried that their own results aren't actually validated either.

I want to focus on a simple problem i.e. pressure distribution/drag coefficients

Regards,

St

Far · March 26, 2013, 01:18

What is the Reynolds number of flow?

oj.bulmer · March 26, 2013, 06:17

I would start looking into journals like sciencedirect/springerlink etc You are likely to find some good papers there.

OJ

RealENG22 · March 26, 2013, 18:22

In terms of the Reynolds Number. I haven't set a specific number, I am open to running the solution for a number of different Re/velocities to allow a comparison between them as well as against experimental data...

RealENG22 · March 26, 2013, 18:24

Thanks OJ,

I have got 1 from sciencedirect for my lit review. I found it last night and it may be that one which I replicate in my CFD as there is plenty of detail regarding the setup.

Far · March 26, 2013, 18:32

As a beginning, I would suggest Re= 100 and 200. You will find a lot of literature and you can record a very nice flow picture (vortex shedding) from your simulation. Behind certain Re, flow will be 3d and turbulent. Also you may encounter transitional flow which is very much difficult to model.

PS: High quality hexa mesh for cylinder of dia = 1 m (or 2m) is attached on one of the threads in Ansys meshing forum.

RealENG22 · March 26, 2013, 18:40

Thanks Far,

I will work on my mesh a little more tomorrow and I will have a look at the Hexa mesh too.

I currently have a quad mesh.

You don't happen to know where I can find how to see the vortex shedding? I know how to view pressure/temp contours etc.

And this may sound silly but from my fluid mechanics studying I learnt that Re below 2500-3000 is laminar. So is vortex shedding present in laminar and turbulent flows?

Cheers

Far · March 26, 2013, 18:43

You will find good info and mesh here: http://www.cfd-online.com/Forums/ans...cylinders.html

That range of Re is for pipe flow. For external flow range is different.

RealENG22 · March 26, 2013, 18:52

Ohhhh that makes sense now! Is there still a rule which can be applied to external flow?

March 25, 2013, 13:49	Literature to validate Flow over Cylinder	#1
RealENG22 Member Steve Mcharg Join Date: Mar 2013 Posts: 31 Rep Power: 13	All, Does anyone have anyone have any good sources/links to literature (preferably numerical/experiemental) which I could compare by creating my own CFD in Ansys Fluent. I found one from WASET but I am worried that their own results aren't actually validated either. I want to focus on a simple problem i.e. pressure distribution/drag coefficients Regards, St

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March 26, 2013, 01:18		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	What is the Reynolds number of flow?

March 26, 2013, 06:17		#3
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	I would start looking into journals like sciencedirect/springerlink etc You are likely to find some good papers there. OJ

March 26, 2013, 18:22		#4
RealENG22 Member Steve Mcharg Join Date: Mar 2013 Posts: 31 Rep Power: 13	In terms of the Reynolds Number. I haven't set a specific number, I am open to running the solution for a number of different Re/velocities to allow a comparison between them as well as against experimental data...

March 26, 2013, 18:24		#5
RealENG22 Member Steve Mcharg Join Date: Mar 2013 Posts: 31 Rep Power: 13	Thanks OJ, I have got 1 from sciencedirect for my lit review. I found it last night and it may be that one which I replicate in my CFD as there is plenty of detail regarding the setup.

March 26, 2013, 18:32		#6
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	As a beginning, I would suggest Re= 100 and 200. You will find a lot of literature and you can record a very nice flow picture (vortex shedding) from your simulation. Behind certain Re, flow will be 3d and turbulent. Also you may encounter transitional flow which is very much difficult to model. PS: High quality hexa mesh for cylinder of dia = 1 m (or 2m) is attached on one of the threads in Ansys meshing forum.

March 26, 2013, 18:40		#7
RealENG22 Member Steve Mcharg Join Date: Mar 2013 Posts: 31 Rep Power: 13	Thanks Far, I will work on my mesh a little more tomorrow and I will have a look at the Hexa mesh too. I currently have a quad mesh. You don't happen to know where I can find how to see the vortex shedding? I know how to view pressure/temp contours etc. And this may sound silly but from my fluid mechanics studying I learnt that Re below 2500-3000 is laminar. So is vortex shedding present in laminar and turbulent flows? Cheers

March 26, 2013, 18:43		#8
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	You will find good info and mesh here: http://www.cfd-online.com/Forums/ans...cylinders.html That range of Re is for pipe flow. For external flow range is different.

March 26, 2013, 18:52		#9
RealENG22 Member Steve Mcharg Join Date: Mar 2013 Posts: 31 Rep Power: 13	Ohhhh that makes sense now! Is there still a rule which can be applied to external flow?