Problem when importing .ASC file to FLOW-3D

Fonseps · February 27, 2021, 18:00

After watching the FLOW-3D on-demand videos, I'm trying to run my own model for the first time: a dam break simulation. My goal is to get the outflow hidrograph at the dam breach.

For the topography, I tried to import an .ASC created in QGIS from a GeoTIFF file I previously had. No error message is displayed and the STL file is apparently created.

However, no solid surface is displayed in the model setup, even if I use the "fit to screen" button. The x, y and z axes also disappeared. Does anyone know what's going on?

Flow Science Australasia · February 27, 2021, 18:18

I've experienced a delay before when loading larger ASC files. On a recent model, my ASC was over 300MB and it took a minute or two for the ASC to show up after loading into the component list. One thing to check is the bottom right part of the display window and see if you notice a status bar with "some task" shown in the title.

Fonseps · February 27, 2021, 18:27

Quote:

Originally Posted by Flow Science Australasia

I've experienced a delay before when loading larger ASC files. On a recent model, my ASC was over 300MB and it took a minute or two for the ASC to show up after loading into the component list. One thing to check is the bottom right part of the display window and see if you notice a status bar with "some task" shown in the title.

I waited a few minutes to no result. There's no status bar on the bottom right.
Thanks for the reply, though!

koful · March 22, 2021, 07:18

asc files were imported as a surface. you can check the extents at the min/max menu from subcomponent's properties. Maybe after creating a mesh and FAVOR, your geometry can appear. Otherwise the file is broken most probably. Did you try to open the geometry with another software?

Kaushik B · May 6, 2021, 05:54

When you create *.asc from QGIS, it some scales the values. So when you import the geometry in FLOW-3D, you will need to do a scaling or magnification. This should help you see the geometry. you may see the limiters value to help you know if there is a geometry imported.

smantha · February 21, 2023, 11:21

I faced the same issue as you. After importing my ASC file and a couple of clicks (toggling layer visibility) in Flow-3D, a dot appeared, which I carefully zoomed into and realized that the X & Y are too small to be rendered well compared to Z.

The problem was the ASC file was generated in decimal degrees with a very small cellsize (~10^-5), but as ASC does not have projection information, it was being considered literally in Flow-3D.

Upon editing the ASC file (right click and open with Notepad/ Notepad++) X & Y limits and cellsize according to the dataset, the ASC file is visible in Flow-3D as expected.

RichadChuck · March 16, 2023, 10:16

you will need to do a scaling or magnification. This should help you see the geometry. you may see the limiters value to help you know if there is a geometry imported.

February 27, 2021, 18:00	Problem when importing .ASC file to FLOW-3D	#1
Fonseps New Member Join Date: Feb 2021 Posts: 2 Rep Power: 0	After watching the FLOW-3D on-demand videos, I'm trying to run my own model for the first time: a dam break simulation. My goal is to get the outflow hidrograph at the dam breach. For the topography, I tried to import an .ASC created in QGIS from a GeoTIFF file I previously had. No error message is displayed and the STL file is apparently created. However, no solid surface is displayed in the model setup, even if I use the "fit to screen" button. The x, y and z axes also disappeared. Does anyone know what's going on?

February 21, 2023, 11:21	Are your ASC coordinates in degrees?	#6
smantha New Member SKM Join Date: Feb 2023 Posts: 1 Rep Power: 0	I faced the same issue as you. After importing my ASC file and a couple of clicks (toggling layer visibility) in Flow-3D, a dot appeared, which I carefully zoomed into and realized that the X & Y are too small to be rendered well compared to Z. The problem was the ASC file was generated in decimal degrees with a very small cellsize (~10^-5), but as ASC does not have projection information, it was being considered literally in Flow-3D. Upon editing the ASC file (right click and open with Notepad/ Notepad++) X & Y limits and cellsize according to the dataset, the ASC file is visible in Flow-3D as expected.

March 16, 2023, 10:16		#7
RichadChuck New Member Join Date: Mar 2023 Posts: 1 Rep Power: 0	you will need to do a scaling or magnification. This should help you see the geometry. you may see the limiters value to help you know if there is a geometry imported. __________________ wow math

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February 27, 2021, 18:18		#2
Flow Science Australasia New Member Eric Lemont Join Date: Aug 2020 Location: Brisbane, Australia Posts: 23 Rep Power: 5	I've experienced a delay before when loading larger ASC files. On a recent model, my ASC was over 300MB and it took a minute or two for the ASC to show up after loading into the component list. One thing to check is the bottom right part of the display window and see if you notice a status bar with "some task" shown in the title.

March 22, 2021, 07:18		#4
koful Member Join Date: Jun 2014 Location: Turkey Posts: 58 Rep Power: 12	asc files were imported as a surface. you can check the extents at the min/max menu from subcomponent's properties. Maybe after creating a mesh and FAVOR, your geometry can appear. Otherwise the file is broken most probably. Did you try to open the geometry with another software?

May 6, 2021, 05:54		#5
Kaushik B New Member Kaushik Join Date: Mar 2009 Posts: 3 Rep Power: 17	When you create *.asc from QGIS, it some scales the values. So when you import the geometry in FLOW-3D, you will need to do a scaling or magnification. This should help you see the geometry. you may see the limiters value to help you know if there is a geometry imported.