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Forum: Main CFD Forum

September 20, 2012, 22:28

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

I think we can agree on the definition of Re...

I think we can agree on the definition of Re based on the momentum comvective flux thru one.cross section divided by viscous flux ... I'm not convinced of the presence.of any inertial forces ..the...

Forum: Main CFD Forum

September 20, 2012, 10:13

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

Viscous forces are not zero because there s a...

Viscous forces are not zero because there s a velocity gradient in the normal to wall direction but they are balanced by pressure difference forces .the.velocity for fully developed flow doesn't...

Forum: Main CFD Forum

September 20, 2012, 10:08

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

How do you define inertial force? You.previously...

How do you define inertial force? You.previously said that it is the convective term in the navier stokes equations..that term is zero for.the.described channel flow.

Forum: Main CFD Forum

September 20, 2012, 08:39

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

I know how.to.calculate the Reynolds number ..my...

I know how.to.calculate the Reynolds number ..my problem was that the term inertial force is not accurate because inertia is zero in that example. I've said this a few times now inertial force is...

Forum: Main CFD Forum

September 20, 2012, 04:41

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

Yeah u.grad u is zero if.velocity doesn't change...

Yeah u.grad u is zero if.velocity doesn't change with distance.like a pipe situation yet we have Reynolds number

Forum: Main CFD Forum

September 20, 2012, 03:30

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

so again..here's the problem ..saying the...

so again..here's the problem ..saying the reynolds number is the ratio of inertial FORCES to viscous forces is misleading ...here's why I think this is so.... look...from what inertial force means in...

Forum: Main CFD Forum

September 19, 2012, 21:41

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

I guess you don't see my point. Take a control...

I guess you don't see my point. Take a control volume in a pipe where velocity profile is not changing with distance. Now if we compute the convective fluxes over the ENTIRE control volume, it is...

Forum: Main CFD Forum

September 19, 2012, 04:10

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

by the convective term you mean (u.del) u where u...

by the convective term you mean (u.del) u where u is the velocity right? well this is also zero for pipe flow for instance where velocity doesn't change on a streamline

Forum: Main CFD Forum

September 19, 2012, 02:02

Replies: 22

What's the meaning of the Reynolds number

Views: 3,372

Posted By Nick R

What's the meaning of the Reynolds number

Hi,

I've heard a lot, especially in cfd context, that the Reynolds number is the ratio between the inertial to viscous forces. Now what I understand from inertial force is (mass times...

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