Comprehensive LS-DYNA® ALE & Structured-ALE Applications Seminar


This course aims to as­sist you with ef­fec­tive­ly per­form­ing flu­id-struc­ture in­ter­ac­tion sim­u­la­tions us­ing the ALE/­FSI mod­ule in LS-DY­NA. It is in­tend­ed for an­a­lysts with a sol­id me­chan­ics back­ground. In this class, a clear frame­work of the method and easy pro­ce­dure to fol­low will be pre­sent­ed which will help you learn the re­quired key­words and pa­ra­me­ters. The course is meant to be com­pre­hen­sive cov­er­ing both con­cepts and ap­pli­ca­tions. Dur­ing this sem­i­nar, ALE con­cepts take about half a day. The rest of the time is spent con­struct­ing pseu­do ALE and S-ALE mod­els. Dur­ing this por­tion, we will de­fine the physics of the prob­lem. Then, you will con­struct a de­taild pseu­do-in­put file for the mod­el (on pa­per). Then we will go over the mod­el­ing de­tails to­geth­er. We hope that this class helps you get your own mod­els go­ing.


ALE Concepts (~1/2 day)

  1. What is ALE?
    1. La­grangian or Euler­ian
    2. Pros and cons
  2. Ad­vec­tion
  3. Com­plex­i­ty of mul­ti-ma­te­r­i­al ALE -In­ter­face re­con­struc­tion
    1. One strain
    2. mul­ti­ple-stress­es
  4. FSI
    1. Why penal­ty method for cou­pling?
    2. Ad­van­tages and dis­ad­van­tages

Examples of ALE Applications (1 day)

A num­ber of com­plex ex­am­ples will be worked through dur­ing the class. We’ll se­lect and work through as many of the ex­am­ples be­low as time al­lows. For the ALE ap­proach, we may have:

  1. So­da can drop
  2. Tank slosh­ing and im­pact
  3. Ex­tru­sion
  4. Bird strike fan blade as­sem­bly mod­el
  5. Pro­jec­tile-tar­get pen­e­tra­tion mod­el­ing
  6. Sim­ple flow in flex­i­ble tube
  7. Hy­dro­sta­t­ic pres­sure ini­tial­iza­tion
  8. Wave im­pact­ing float­ing “ship” (sim­ple mod­el)
  9. Cylin­der (rock­et boost­er) im­pact­ing wa­ter mod­el
  10. Tanker float­ing and mov­ing through wa­ter

S-ALE Modeling Concepts & Example Applications (~1/2 day)

  1. Dif­fer­ences be­tween the orig­i­nal ALE solver and the S-ALE solver
    1. Ad­van­tages of struc­tured mesh­es
  2. Ex­am­ples il­lus­trat­ing the S-ALE ap­proach
    1. Rod pen­e­tra­tion
    2. Ex­plo­sion un­der a plate
    3. Mine blast
    4. Tank slosh­ing
    5. Float­ing boat