The difference between Bulk and Block format

Altair Forum User

Hi everyone

I'm novice RADIOSS. Could you tell me the difference between Bulk and Block format and its applications?

Thank you all.

 

Altair Forum User

Hello,

 

in short words:

 

Radioss Bulk is used for structural analysis (implicit solver, like MSC/Nastran)

Radioss Block is used for crash analysis (explicit solver, like PAMCrash or LSDyna)

 

Special options, e.g. NLGEOM (nonlinear geometric) use also Block Format, but you have to build your model in BULK preference (internaly converted)

 

A little bit more detailed:

 

Finite element solutions via Nastran-type Bulk Data Format include:

• Linear static analysis

• Nonlinear implicit quasi-static analysis

• Linear buckling analysis

• Normal modes analysis

• Complex eigenvalue analysis

• Frequency response analysis

• Random response analysis

• Linear transient response analysis

• Geometric nonlinear explicit and implicit analysis

• Linear fluid-structure coupled (acoustic) analysis

• Linear steady-state heat transfer analysis

• Coupled thermo-mechanical analysis

• Inertia relief analysis with static, nonlinear contact, modal frequency response, and modal transient response analyses

• Component Mode Synthesis (CMS) for the generation of flexible bodies for multi-body dynamics analysis

• Reduced matrix generation

• One-step (inverse) sheet metal stamping analysis

• Fatigue analysis

A typical set of finite elements including shell, solid, bar, scalar, and rigid elements as well as loads and materials is available for modeling complex events.

Finite element solutions via RADIOSS Block format include:

• Explicit dynamic analysis

• Nonlinear implicit static analysis

• Transient heat transfer and thermo-mechanical coupling

• Explicit Arbitrary Euler-Lagrangian (ALE) formulation

• Explicit Computational Fluid Dynamics (CFD)

• Smooth Particle Hydrodynamics (SPH)

• Incremental sheet metal stamping analysis with mesh adaptivity

• Linear static analysis

• Normal modes analysis

• Linear and nonlinear buckling analysis

 

You can read this in the solver manual 'User's Guide > RADIOSS > Introduction: What is Altair RADIOSS?'

 

Regards,

Mario