SimPack: A Complete Beginner’s Guide to Installation and First Simulations

SimPack: A Complete Beginner’s Guide to Installation and First Simulations

Date: February 8, 2026

Introduction SimPack (SIMULIA Simpack) is a professional multibody dynamics (MBD) tool used across automotive, rail, aerospace, wind, biomechanics and industrial machinery to model and simulate complex mechanical systems (rigid and flexible bodies, contacts, actuators, controls and co-simulation). This guide gives a concise, actionable path from obtaining the software to running your first basic simulation.

1. Before you start — system, licensing, and downloads

• Minimum recommended environment (modern release): 64-bit Windows or Linux, Intel/AMD x86-64 CPU, ≥8 GB RAM (16+ GB preferred for larger models), NVIDIA OpenGL-capable GPU (Quadro-class recommended), OpenGL ≥3.2.
• Licensing: SimPack requires a DS/SIMULIA license server (Dassault license / DS Passport) or node-locked license. Confirm with your organization or vendor how licenses are provided.
• Downloads and docs: Obtain installer and official documentation from Dassault Systèmes SIMULIA (3ds.com / Simpack product pages) or your corporate license portal. Also download the “Getting Started” and Installation Guide PDFs.

2. Installation — step-by-step (Windows / Linux)

• Pre-steps:
  1. Ensure OS updates and correct graphics driver (NVIDIA driver version recommended by SimPack release).
  2. Confirm Java, required libraries, and C/C++ compilers only if you plan custom user routines or co-simulation.
• Install:
  1. Run installer as Administrator (Windows) or follow install shell script with root privileges (Linux).
  2. Choose installation directory (prefer no spaces in path).
  3. Select product modules you need (General, Automotive, Flexible Bodies, Realtime, etc.).
  4. Point installer to license server details or apply node-locked key when prompted.
  5. Complete installation and reboot if requested.
• Post-install checks:
  1. Start SimPack GUI; confirm license checkout (help → about or license status).
  2. Run a supplied example model to verify solver and graphics function.
  3. If using MATLAB/Simulink interfaces, confirm MATLAB paths and supported versions per SimPack docs.

3. Workspace basics and model structure

• Key elements: Bodies (rigid/flexible), Joints/constraints, Force elements, Contacts, Sensors/Outputs, Coordinates and Parameters, Solver settings, Postprocessor (plots, animations).
• File types: native model files and flexible body formats (FEM-based imports, FMU support for co-simulation). Use supplied examples to inspect structure before editing.

4. First simulation — a simple 2D double pendulum (practical, prescriptive) Assumptions: default GUI installation, example geometry created inside SimPack.

Step A — Create model

1. New project → create model. Set units (SI) and gravity (g = 9.81 m/s^2).
2. Add two rigid bodies: Body1 (mass m1, length L1), Body2 (mass m2, length L2). Use simple rectangular cross-section or point-mass approximation for quick start.
3. Define joints:
   • Revolute joint between ground and Body1 at Body1 top pivot.
   • Revolute joint between Body1 end and Body2 top pivot.
4. Set inertial properties: assign mass and moment of inertia (or use geometric properties to auto-calc).
5. Add initial conditions: set small nonzero initial angles (e.g., theta1 = 0.2 rad, theta2 = 0.1 rad).
6. Add output sensors: joint angles and angular velocities.

Step B — Solver settings

1. Choose time integration method (default implicit/explicit as recommended by your SimPack release). For nonlinear stiff systems start with an implicit integrator and moderate tolerances.
2. Time step / duration: set t0 = 0, tf = 10 s, time step = 0.001–0.01 s (coarse to fine as needed).
3. Save options and enable numeric solver diagnostics to catch convergence warnings.

Step C — Run simulation

1. Validate model (use model check / diagnostics). Fix any constraint or massless-body errors.
2. Run simulation; watch console for warnings/errors.
3. If diverging, reduce timestep, loosen tolerances, or check joint constraints and initial overlaps.

Step D — Postprocessing

1. Animate the motion to visually inspect behavior.
2. Plot joint angles over time and verify expected oscillatory dynamics.
3. Export results (CSV or MATLAB compatible) for further analysis.

5. Common beginner pitfalls and fixes

• Licensing errors: ensure license server reachable and feature includes your module.
• Graphics problems: update NVIDIA OpenGL driver and verify environment variable settings for remote sessions.
• Constraint singularities: double-check joint definitions and initial positions to avoid overconstrained or inconsistent kinematics.
• Divergence/non-convergence: reduce timestep, change integrator, or linearize parts of the model for debugging.
• Units mismatch: always verify units for geometry, mass, forces and initial conditions.

6. Next steps and learning resources

• Work through the official “Getting Started” guide and included tutorials (slider-crank, double pendulum examples).
• Explore flexible body workflows (import FE meshes from Abaqus/ANSYS), co-simulation with Simulink, and FMU export/import.
• Attend official SimPack training courses or vendor technical support for advanced topics (realtime, HIL, flexible multibody with contact).
• Useful reference pages: SimPack product page on 3ds.com, SimPack installation guide PDF, vendor training pages.

7. Quick troubleshooting checklist

• Cannot start GUI: check license, display driver, and required OpenGL version.
• Model validation fails: run model-check, inspect constraints, set independent DOFs.
• Results look wrong: confirm units, initial conditions, and sensor placement.

Closing (practical advice) Start small: use supplied example models, change one parameter at a time, and get comfortable with solver settings and post-processing. As you progress, import CAD/FEM data, add control logic or co-simulate with Simulink.

If you want, I can produce:

• A step-by-step script/recipe tailored to your SimPack version (specify Windows/Linux and version), or
• A ready-made double-pendulum model file outline with numeric values and expected plots.