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LS-DYNA Mesh Convergence and Time Step Sensitivity

30 Chapters
View Course Samples Online
01
Introduction to mesh convergence and time step sensitivity in LS-DYNA
definitions, engineering relevance, and course roadmap.
convergencesensitivity
02
LS-DYNA explicit time integration fundamentals
central difference method, critical time step, and Courant condition.
LS-DYNAexplicit
03
Element characteristic length and wave speed
how mesh size and material properties determine the stable time step.
characteristicmaterial
04
Mass scaling in LS-DYNA
selective and global mass scaling, added mass ratio, and effects on time step and accuracy.
LS-DYNAselective
05
Time step control keywords
*CONTROL_TIMESTEP, TSSFAC, DTINIT, and related parameters for explicit analyses.
keywordsCONTROL
06
Mesh convergence study workflow
problem definition, mesh refinement levels, and convergence metrics for LS-DYNA simulations.
convergenceworkflow
07
Solution verification and validation
distinguishing discretization error from modeling error in LS-DYNA results.
Solutionverification
08
Convergence metrics for field variables
displacement, stress, strain, and energy norms across mesh densities.
Convergencevariables
09
Local vs global mesh refinement
h-refinement, r-adaptivity, and their practical implementation in LS-DYNA.
refinementh-refinement
10
Mesh convergence for solid elements
hexahedral vs tetrahedral meshes, hourglass control, and element formulation effects.
convergenceelements
11
Mesh convergence for shell and beam elements
shell formulations, through-thickness integration, and mesh density guidelines.
convergenceelements
12
Contact and impact simulations
mesh size effects on contact stiffness, penetration, and energy transfer.
simulationsstiffness
13
Time step sensitivity in crashworthiness analysis
mass scaling trade-offs, run time, and result fidelity.
sensitivitycrashworthiness
14
Time step sensitivity in blast and impact simulations
shock wave propagation, mesh size, and stable time step constraints.
sensitivitysimulations
15
Time step sensitivity in metal forming
explicit vs implicit, mass scaling strategies, and springback accuracy.
sensitivityexplicit
16
Adaptive time stepping and subcycling in LS-DYNA
*CONTROL_SUBCYCLE, selective subcycling, and performance implications.
Adaptivestepping
17
Implicit vs explicit time integration
time step selection, convergence criteria, and when to choose each in LS-DYNA.
Implicitexplicit
18
Energy balance and hourglass energy as convergence indicators
monitoring *DATABASE_GLSTAT and *DATABASE_MATSUM.
hourglassconvergence
19
Mesh convergence for composite materials
ply-based meshing, delamination, and time step constraints.
convergencecomposite
20
Mesh convergence for foam and low-density materials
material stability, strain rate effects, and time step reduction.
convergencelow-density
21
Practical mesh convergence study
designing a refinement study for an automotive crash box in LS-DYNA.
convergencedesigning
22
Practical time step sensitivity study
mass scaling calibration for a drop test simulation in LS-DYNA.
sensitivitycalibration
23
Automated mesh convergence workflows
scripting with LS-DYNA keywords and Python for parametric studies.
Automatedconvergence
24
Post-processing for convergence assessment
using LS-PrePost to extract and compare results across meshes.
Post-processingconvergence
25
Case study
mesh convergence and time step sensitivity in a sheet metal forming simulation.
convergencesensitivity
26
Case study
mesh convergence and time step sensitivity in a bird strike or impact simulation.
convergencesensitivity
27
Case study
mesh convergence and time step sensitivity in a crashworthiness simulation with contact.
convergencesensitivity
28
Best practices for mesh design in LS-DYNA
element quality, aspect ratio, and transition zones.
practicesLS-DYNA
29
Best practices for time step management
mass scaling limits, energy checks, and documentation.
practicesmanagement
30
Course summary
integrating mesh convergence and time step sensitivity into a reliable LS-DYNA simulation workflow.
integratingconvergence