Learning Forum

[Giannis123]

Hello,

I am searching for a way to export a curve from the post-processor. Number of deleted elements versus simulation time. Does anybody know if there's something that can be set in the post-processor as database output or something?

Thanks,

Giannis

[tslavik]

There is no way to directly plot the time-history of eroded elements from LS-Prepost. Below are some ideas that might help you.
[Method #1] -- If you're on a Linux platform, a quick way to extract that information is this:
grep 'failed at time' d3hsp > fail_list [ or grep on the mes**** files for MPP ]
There might be an equivalent command for Windows.
[Method #2] -- SCL is a scripting language for LS-PrePost. We cannot provide direct links on ALF but can tell you to search on this string with Google "lsprepost sclexamples" That should take you to a pdf file on an FTP site. In the folder where that pdf resides you will also find a zip file of examples. As described in lsppscripting.pdf, to run a Python script, you need to:
1) Download and install Python 3.6. Take a note of the installation directory of Python on Python's website.
2) Use LS-PrePost 4.8 or newer.
3) Before you run a Python script for the first time, you need to point LS-PrePost to the folder that contains the python.exe executable. To do that, please issue the following command in the command line of LS-PrePost.
> setpythonhome "python_home_directory"
4) To run a python script that is located in the same folder with d3plot, type the following in the command line of LS-PrePost.
runpython "my_script.py"
[Method #3] -- Read the d3plot into LS-PrePost.
- Make sure that "View > Show Deleted Elements" is deactivated.
- Go to the state of interest.All elements except for the eroded elements will be displayed.
- SelectElement Tools> Blank >Click "Active" in the "Sel. Elem." window. This should remove (blank) all the displayed elements. Note that this does not blank the eroded elements because the eroded elements were not displayed (active) when we performed the blanking operation.
- Go to the first animation state. Only the eroded elements should be displayed.
- UsePost > Output > Element > Curr > Writeto produce *ELEMENT data for the eroded elements.

[Andreas Koutras]

Hello Giannis,
Below is Python API script that combines the Methods 2 and 3 mentioned above. You can adjust it based on your needs.

from DataCenter import get_data
from LsPrePost import save_dc_to_file, execute_command, switch_state

Nstates=get_data('num_states')
eroded_elements=[0]*Nstates

for i in range(1,Nstates):

execute_command("clearpick")
execute_command("unblank all 19")
execute_command("postmodel on")

execute_command("postmodel off")
execute_command("+M 1 3") #Select only parts 1 and 3.

switch_state(i)

execute_command("genselect target element")
execute_command("genselect allvis")
execute_command("blank selection")
execute_command("state 1;")

ele_list = get_data('active_elements_ids')

eroded_elements[i]=len(ele_list)

save_dc_to_file('num_of_eroded.dat', Nstates, eroded_elements)