Importing terrain data

jm2011 · December 29, 2011, 00:37

Hey,

I am interested in modelling air flow over a specific terrain by uploading a .txt file into ANSYS workbench (containing Eastings, Northings and elevation data). I have found a sample terrain file loaded into ANSYS which contains two additional numbers in column A1 and B1 respectively... My best guess is that they represent the number of splines?!

Does anyone know what these numbers represent?

Thanks,

egge24 · December 29, 2011, 11:20

Did you find out? I'm trying to model water flow over an irregular bathymetry, but I do not know how to import my bathymetry file to ANSYS in order to mesh the domain. I heard we need to convert our .xyz file (point cloud) into a surface that could be imported to ANSYS...

If you find out how to do it, please, share how!!

Thanks

jm2011 · December 30, 2011, 00:54

Oh cool. I had a go with .xyz files, not successful so far. I managed to upload points into ICEM from a .txt file, but this won't help as you would need to manually create surfaces from there on...
Will post my solution as soon as I find out! Please share if you have any success yourself!

egge24 · December 30, 2011, 06:46

Jm2011,

I managed to do it using Gambit2.4.6. Using the Create Real Face From Vertex Rows (Geometry > Face > Vertex Rows) command allows you to create a four-sided face by specifying a series of vertex rows that define the surface of the face:

1 - create a .xyz file vertices in an ordered sequence that represents the position of each vertex in a sequential series of rows.

2 - import points to Gambit, File > Import > Vertex data

3 - Create a Face, Geometry > Face > Vertex Rows

Good luck!

jm2011 · January 9, 2012, 06:57

Hi Egge24,

Thank you for your advice! Unfortunately I don't have access to ANSYS very much at the moment, but I will try out Gambit as soon as I can.

I have been watching a tutorial from the ANSYS website, where a terrain file is imported into ICEM as .xyz file, however I just cannot figure out what the two numbers in the first row represent and how to determine them. I have included a screen-shot of the file as shown in the video. Maybe you know?! Or someone else.

jm2011 · January 9, 2012, 06:59

Here it is...

egge24 · January 11, 2012, 08:31

Jm2011,

The two numbers of the first line represent the number of point for each curve, and the number of curves for each surface.

See pg. 60 from http://www1.ansys.com/customer/conte...fd/icmhelp.pdf

CaoimhinOC · January 17, 2012, 11:05

Hi guys, I am also trying to import a 3D terrain into ANSYS, I will be using CFX, I have a text file of x,y and z co-ordinates. I was just wondering is there any updates on how to imprt this and create a surface?

jm2011 · January 25, 2012, 23:19

Thank you. While I understand what these numbers mean now, I do not know how I would know what values to enter for my model...

Nonetheless I have been able to upload my terrain as STL file, from which I could then generate a volume mesh in ICEM.

December 29, 2011, 00:37	Importing terrain data	#1
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 15	Hey, I am interested in modelling air flow over a specific terrain by uploading a .txt file into ANSYS workbench (containing Eastings, Northings and elevation data). I have found a sample terrain file loaded into ANSYS which contains two additional numbers in column A1 and B1 respectively... My best guess is that they represent the number of splines?! Does anyone know what these numbers represent? Thanks,

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December 29, 2011, 11:20		#2
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 16	Did you find out? I'm trying to model water flow over an irregular bathymetry, but I do not know how to import my bathymetry file to ANSYS in order to mesh the domain. I heard we need to convert our .xyz file (point cloud) into a surface that could be imported to ANSYS... If you find out how to do it, please, share how!! Thanks

December 30, 2011, 00:54		#3
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 15	Oh cool. I had a go with .xyz files, not successful so far. I managed to upload points into ICEM from a .txt file, but this won't help as you would need to manually create surfaces from there on... Will post my solution as soon as I find out! Please share if you have any success yourself!

December 30, 2011, 06:46		#4
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 16	Jm2011, I managed to do it using Gambit2.4.6. Using the Create Real Face From Vertex Rows (Geometry > Face > Vertex Rows) command allows you to create a four-sided face by specifying a series of vertex rows that define the surface of the face: 1 - create a .xyz file vertices in an ordered sequence that represents the position of each vertex in a sequential series of rows. 2 - import points to Gambit, File > Import > Vertex data 3 - Create a Face, Geometry > Face > Vertex Rows Good luck!

January 9, 2012, 06:57		#5
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 15	Hi Egge24, Thank you for your advice! Unfortunately I don't have access to ANSYS very much at the moment, but I will try out Gambit as soon as I can. I have been watching a tutorial from the ANSYS website, where a terrain file is imported into ICEM as .xyz file, however I just cannot figure out what the two numbers in the first row represent and how to determine them. I have included a screen-shot of the file as shown in the video. Maybe you know?! Or someone else.

January 11, 2012, 08:31		#7
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 16	Jm2011, The two numbers of the first line represent the number of point for each curve, and the number of curves for each surface. See pg. 60 from http://www1.ansys.com/customer/conte...fd/icmhelp.pdf

January 17, 2012, 11:05		#8
CaoimhinOC New Member Caoimhin Join Date: Dec 2011 Posts: 4 Rep Power: 15	Hi guys, I am also trying to import a 3D terrain into ANSYS, I will be using CFX, I have a text file of x,y and z co-ordinates. I was just wondering is there any updates on how to imprt this and create a surface?

January 25, 2012, 23:19		#9
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 15	Thank you. While I understand what these numbers mean now, I do not know how I would know what values to enter for my model... Nonetheless I have been able to upload my terrain as STL file, from which I could then generate a volume mesh in ICEM.