Learning Forum

[mehdiyahia1]

Hello.

Is there an option in Design Modeler that allow us to import a terrain with reliefs.

The map is prepared with google earth?

[Rob]

What formats do you have available? You may be better off with SpaceClaim as there are more import options. 

[mehdiyahia1]

Rwoolhou thank you for your reply.

I have several formats, DWG DXF Sat and stl, with sat I can open it in DM but not in form, I can't manipulate this figure.
I have a XYZ file that I need to be able to upload to DM.
for SpaceClaim I've never used them before .

[Rob]

If it's rows of points the check out the line import into DM. We don't have a point cloud reader (rather we can't do much with it afterwards except manually join all the dots up) so really need the surface. 

Try reading the stl into SpaceClaim and see what you get. Then read up (on here) about working with stl files: the student version is limited in how many cells, surfaces etc it can handle so you may have problems. 

[mehdiyahia1]

I used Spaceclaim but it's the same , I can't manipulate

 

[Rob]

Can't import, manipulate graphics or work on the surface?  Images would help. 

[mehdiyahia1]

I can import, but I can't manipulate.

[mehdiyahia1]

I have this comment: the mesh size is not impermeable.

 

[Rob]

Please can you add images in line? Staff are not permitted to open/download files or attachments. 

[mehdiyahia1]

[peteroznewman]

You can right mouse click on the Facet body and Convert to Solid, then it will be available to edit and mesh.

[mehdiyahia1]

Peterosnewman thank you for your answer

For the conversion to solid it is done. but not to be able to edit  .

[peteroznewman]

What edit do you want to do?

There are some tools to clean up the facet body before conversion to solid.

Once the facet body has been cleaned up, the solid body should be able to be split with a plane for example.

[peteroznewman]

Here is a video on using STL files.

[mehdiyahia1]

Unfortunately does not work

[mehdiyahia1]

[mehdiyahia1]

I want to simulate the influence of terrain on wind speed and direction.
for that I need a domain with a base it is our land

[peteroznewman]

You need solid to represent the air. How thick should it be?  Which side is the air on: +Z or -Z?

Put the STL file inside a zip file. You can attach a zip file. 

Also attach the .scdoc file if it is < 120 MB.

[mehdiyahia1]

I need the terrain as a solid , and above this terrain the air as shown in the picture.

 

[peteroznewman]

I see you are using ANSYS 2019 R1.

When reading STL files, it is easy the get the units wrong.  What are the units in the STL file?

If they are mm, then the area is about 11.1 x 9.5 meters.  Is that correct?  That is what is in your SpaceClaim doc.

[mehdiyahia1]

The unit is Km 11.1 km*9.5km

[Rob]

Don't try and scale in geometry, it can mess with the tolerances (all CAD has this issue). As you're in ANSYS 2019Rx you just need a shell (surface) model of the ground, sides & sky. Then have a look at Fluent Meshing Watertight Workflow outside of Workbench. This works best with "normal" CAD but there are ways around that too.  

[mehdiyahia1]

 To be honest, this is the first time I've heard "Fluent Meshing Watertight Workflow"

[mehdiyahia1]

where I can find it?

[peteroznewman]

This video shows how to create two watertight STL bodies that you can use to mesh the air and the earth.

https://youtu.be/-0p3m0AHDwc

 

Attached is an ANSYS 2019 R2 SpaceClaim document (can't be opened with R1).

[Rob]

Here you go, https://www.youtube.com/watch?v=zFsa1Ezot8Y  If you follow Peter's instructions you can use Workbench as well. 

[mehdiyahia1]

Very helpful thank you very much match sir Peteroznewman .

[mehdiyahia1]

I mind where i can find Fluent Meshing Watertight Workflow in Ansys

[peteroznewman]

In the Student license for 2019 R2, you have to start the Standalone Fluent program. See this tutorial that is for the Fluent Fault Tolerant Meshing which shows the commands to do this and turn on the Beta feature. You can get to the Watertight Workflow from this same place.

[mehdiyahia1]

Thank you sir

[mehdiyahia1]

I want to draw a building on this terrain, is that possible?

[peteroznewman]

Draw the Building solid and subtract it from the Air solid.

[mehdiyahia1]

Thank you, I've done it!

[Rajasekhar]

Hello Peteroznewman,

 

I hope you are doing great. i have followed the above tutorial titled : This video shows how to create two watertight STL bodies that you can use to mesh the air and the earth. However i am not getting the desired result as shown in the above video. i am attaching the STL file of the terrain. please check this and will you please help me to solve this issue. https://we.tl/t-WNR8nztd01.

Thanks for your time and consideration,

Thankyou,

Rajasekhar.

[peteroznewman]

Hello Rajasekhar,

Your STL is not clean like Mena's was.  Here is the report on import into SC 2019 R3.

It has a mixture of closed facet bodies and open facet bodies and some hanging facets.

You have buildings floating above the ground.

Other blocks are completely below ground.

If you Separate All on the Facets tab, there is one facet that seems to be just Ground.

You have to clean up the data before you can create air or earth.  What is your goal, just air or both?

What version of ANSYS are you using?

Please start a New Discussion as this is already too long. You can insert a link to this post.

[Wali]

Hello Peteroznewman,

I am working with Rajasekhar, below is the new discussion link. Please have a look

 

/forum/forums/topic/wind-terrain-model-using-space-claim/?order=all#comment-769f5ff6-5d7a-4e4f-ba87-ab6e0121bce8

Thanks