Problem with ALE me...
 

Problem with ALE method for explosion  

 

lsdynastudent
(@lsdynastudent)
New Member
Joined: 2 days ago
Posts: 1
March 26, 2020 6:22 pm  

Hi all,

I have been working in an explosion with the ALE method, but I am not able to see the wave propagation in the pressure, which means that the explosion did not occur.

I would like to increase the size of my explosive to see whether this is the problem or not, because I am so desperate.

If some expert could contact me in private I would be really grateful, I really do not know what else to do


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Negative Volume
(@negativevolume)
Estimable Member Admin
Joined: 1 year ago
Posts: 190
March 27, 2020 2:41 pm  

Hi @lsdynastudent

I know learning LS-Dyna is tough, especially when you are working with explosions (which I am not familiar with.) But I would suggest that you try to look at the energy plots of your simulation to see if anything is happening. You should see some energy spikes if your explosion happened and is just too small. 

You may need to re-run your simulation if you did not setup your *Database_options for GLSTAT, which is the global statistics and will allow you to look at the overall energy of your simulation.

You will need to add this to your code and change the DT bolded value to be whatever time interval you want to look at your energies. So if if is a 10 ms simulation, make this lower than 0.1 ms. 

*DATABASE_RCFORC
$#    DT   BINARY    LCUR   IOOPT
0.1, 3, 0, 1

More details about database ascii options are below:

https://feassistant.com/forums/ls-dyna/database-functionality/#post-115

If there is a little energy at least, then I would definitely double check that you units in your model match up. 

Let me know how it goes!


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