Viscous Model

farias2014 · November 25, 2017, 13:21

I am trying to do a flow simulation on my plane. So far i have been using the k-epsilon 2 equations because i saw that on a YouTube video. I am completely new to fluent. I am trying to learn or the terminology.

How do i know which viscous model to use? Do i have to do some hand calculations?

I have a delta wing plane with canards at 100 m/s. For mesh i used tetrahedrons, curvature, coarse. My orthogonality quality seems to be 0.099 with a maximum aspect ratio of 30.

Thanks for the help.

Kirill-MIPT · November 29, 2017, 02:20

Hello! For such a simulation one should study boundary layer theory. You need a mesh with inflation and prism elements in the boundary layer. How to distribute points in the boundary layer - take y+ value =1 for first layer thickness. For turbulence modeling sst kw is very good, and transition sst can be used for transition modeling (study turbulence and boundary layer theory - you need them)

farias2014 · December 1, 2017, 20:06

Thanks for the help. I will try to learn boundary layer thickness. I have a fluids books. Do you have any good books as reference to study? I will take your suggestions.

Kirill-MIPT · December 4, 2017, 05:54

Hermann Schlichting, Theory of Boundary Layer

November 25, 2017, 13:21	Viscous Model	#1
farias2014 New Member Felix Issac Arias Alvarez Join Date: Oct 2017 Posts: 5 Rep Power: 8	I am trying to do a flow simulation on my plane. So far i have been using the k-epsilon 2 equations because i saw that on a YouTube video. I am completely new to fluent. I am trying to learn or the terminology. How do i know which viscous model to use? Do i have to do some hand calculations? I have a delta wing plane with canards at 100 m/s. For mesh i used tetrahedrons, curvature, coarse. My orthogonality quality seems to be 0.099 with a maximum aspect ratio of 30. Thanks for the help.

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November 29, 2017, 02:20		#2
Kirill-MIPT Member Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10	Hello! For such a simulation one should study boundary layer theory. You need a mesh with inflation and prism elements in the boundary layer. How to distribute points in the boundary layer - take y+ value =1 for first layer thickness. For turbulence modeling sst kw is very good, and transition sst can be used for transition modeling (study turbulence and boundary layer theory - you need them)

December 1, 2017, 20:06		#3
farias2014 New Member Felix Issac Arias Alvarez Join Date: Oct 2017 Posts: 5 Rep Power: 8	Thanks for the help. I will try to learn boundary layer thickness. I have a fluids books. Do you have any good books as reference to study? I will take your suggestions.

December 4, 2017, 05:54		#4
Kirill-MIPT Member Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10	Hermann Schlichting, Theory of Boundary Layer