CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Rough wave boundary layer

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   February 15, 2019, 05:04
Default Rough wave boundary layer
New Member
Join Date: Feb 2019
Posts: 1
Rep Power: 0
Dora101 is on a distinguished road
Dear Foamers,

I am trying to use interFoam to compute the wave-induced bed shear stress on rough bed. The problem is that I need very fine mesh near the bed ( in order of 0.2 mm) to capture the wave boundary layer.

In case of smooth bed, this doesn't represent an issue . In this case interFoam results is in very good agreement with the experimental measurements for both laminar and turbulent conditions.

The problem is when I am trying to model the rough bed. Then only way I could find to represent the surface roughness in OpenFOAM is by using one of the rough wall function (nutkRoughWallFunction or nutURoughWallFunction.

When using this wall function at the beginning I noticed that the modeled bed shear stress is an order of magnitude smaller than the experimental values. Then I realized that at this mesh resolution, the rough wall function will not include the effect of the roughness since this require Y+ to be in order of 30. Actually this raise a question also regarding the validity of using a wall function for such fine mesh near the wall (Y+ in order of 1). I also discovered that the resulting bed shear stress is highly mesh dependent( increases when Y+ increase)

So my question is, how I can model this rough surface in turbulent flow while preserving the mesh resolution?

Any help is highly appreciated

Kind regards
Dora101 is offline   Reply With Quote


shear stress, turbule model, wall functions, wave boundary conditions

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[snappyHexMesh] Help with Snappy: no layers growing GianF OpenFOAM Meshing & Mesh Conversion 2 September 23, 2020 08:26
Radiation in semi-transparent media with surface-to-surface model? mpeppels CFX 11 August 22, 2019 07:30
Basic Nozzle-Expander Design karmavatar CFX 20 March 20, 2016 08:44
Problem in setting Boundary Condition Madhatter92 CFX 12 January 12, 2016 04:39
Low Mixing time Problem Mavier CFX 5 April 29, 2013 00:00

All times are GMT -4. The time now is 08:20.