Material properties
 

Dear experts,

I'm a researcher at a university in Taiwan. I'm running a simulation a physical experiment relating to sediment scour model. In that experiment, they used a plastic mesh to reduce the erosion at the beginning of the flume.
http://i01.i.aliimg.com/img/pb/714/0...r1_6824282.jpg
I don't know how to setup the material familiar with that plastic mesh.
Please help me!!!
Thanks so much for your help.

Thanks for your reply.
I tried to find the characteristics of that kind of material, however, that showed some information such as polyethylene, Aperture, mesh width, etc which we can not assign it in FLOW3D as a new material you did mention.
I found out one solution for that problem. Because we can define that plastic mesh as a porous block, i tried to run many times and it's not so bad even though some warning occurred.
Do you think that is a solution, @user01?

Hi,

Yes, you can also define the component as porous geometry. If you do in that way, you will need the porosity value for the material.

On the other hand, if you want to do in the way I did, following this steps you will get what you are looking for. The main problem for this way is that if the mesh is too small you should define a small cell size also to catch the geometry, taking also into account aspect ratio values, transitions from cell to cell...

My proposal is the next one:

1) Define the geometry you need. Draw it in a CAD program and save it as stl. file.
2) Find material characteristic.
3) Normally the materials database is here: C:\flow3d\v11.1\gui\MaterialsDatabase
4) Copy one file, change the name and open with a text editor.
5) The file format is easy to understand. If you need to add a property or change one that the material you copy have, you can check the variable name to copy it in the text file putting the mouse above the variable.
(In the principal window of Flow3d: Materials -> Solid database... -> View)

6) You will find your new material at the end of material database. Change also the material name inside the file to visualize correctly in the GUI.

For me, this is the best way for the application you are looking for. In that way you can define surface roughness, friction coefficients... of the material correctly.

If you want you can send me the prepin file and I will check it.

Best regards.

Thank you so much @User01.
I've known that way also can help me to solve that problem before and i tried it.
However, based on your help, I think that way is more flexible and more accurate than my method now because we can control individual parameter by ourselves and make optimization these parameters by using Caese later (I think so)
I tried your approach by Editing an available material in the "Select material" window (Materials -> Solid database... -> Copy -> Edit) and I got the reasonable results now.

Thanks for your enthusiasm support again, @User01.