CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > FLOW-3D

Modeling Riverbed

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 25, 2017, 15:51
Default Modeling Riverbed
New Member
Michael B
Join Date: Jan 2017
Posts: 1
Rep Power: 0
MichaelMAB is on a distinguished road
I am working on a thesis project attempting to model flow through a small stream and calculate the critical flow velocities and shear stresses necessary to initiate sediment transport. However, I am having trouble modeling the river geometry data in a suitable .stl format. I have a temporary academic license, so no access to support from Flow-3D staff.

I have several cross-sections of the river in the x-z plane located every 50m or so. I also have the GPS data, so I know where the river begins along the y plane. My question is, how do I take these xyz points and convert them into an .stl file? It seems that using a program like Civil-3D or ArcGIS would be difficult, because the conversion from TIN to .stl isn't an easy one. I was considering importing the points from excel into Solidworks, and then using the Loft function to connect each plane. Does anyone have a better solution?

I also need to make sure the surface roughness of the model matches that of the riverbed. Is there a way to specify roughness in Flow-3D? Can you change the fluid friction using the Chezy formula?
MichaelMAB is offline   Reply With Quote

Old   February 3, 2017, 15:26
Join Date: Mar 2012
Posts: 72
Rep Power: 14
dmilano is on a distinguished road
Look in to the raster/ASC import option. It'll import ESRI raster files for both topography and roughness so you can bypass the STL conversion.

Roughness is set in terms of the actual roughness height in the component properties->surface properties.
dmilano is offline   Reply With Quote

Old   February 6, 2017, 12:23
New Member
Join Date: Apr 2012
Posts: 25
Blog Entries: 1
Rep Power: 14
bfox48 is on a distinguished road
Using the ASC is a good approach. There are also simple ways to import a surface from civil3D to an STL. In civil3D you will need to convert the surface object to 3D faces, Then extrude them so that it is now a solid 3D object. From here you can use the STLout command to export it to an stl file that can be imported into FLOW3D. There are several tutorials online that you can find through a google search.
bfox48 is offline   Reply With Quote


flow 3d, model, roughness, stl

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
transport property when modeling combustion vahidzanganeh OpenFOAM Running, Solving & CFD 3 September 12, 2015 03:39
side jet modeling for a missile: 1st order or 2nd order scheme AmirBaqa1987 ANSYS 1 March 19, 2014 04:39
May Focus Area: Turbulence Modeling Jonas Larsson CFD-Wiki 0 May 2, 2006 11:48
Modeling Flow/Saturation/Absorption in Fibers Gene Dougherty Main CFD Forum 0 June 6, 2003 14:49
CFD Modeling of Two-phase Flow in Small Dia.Tubes Eric Poindexter Main CFD Forum 2 September 22, 2000 09:21

All times are GMT -4. The time now is 09:15.