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Navisworks Manage: Ultimate Guide to Model Coordination and Clash Detection

Navisworks Manage is Autodesk’s advanced project review and coordination tool for AEC teams, designed to aggregate 3D models and 2D data from multiple disciplines into a single environment for visualization, clash detection, and construction simulation. This post explains what Navisworks Manage does, when to use it, key features, best practices, and a simple workflow to get started.

2. Advanced Clash & Interference Detection

This is the flagship feature of Navisworks Manage.

• Clash Tests: Users can define rules to detect hard clashes (e.g., a pipe passing through a steel beam), clearance clashes (e.g., insufficient space for valve operation), or duplicate instances.
• Automated Resolution: The software groups clashes by type, severity, or location. It allows assignation of clashes to team members, tracks resolution status, and generates clash reports in HTML, XML, or text format.
• Real-time Navigation: After detection, users can zoom directly to each clash, take redline markups, and create viewpoint snapshots to communicate issues clearly.

3. 4D Construction Simulation

Navisworks Manage bridges the gap between the 3D model and the project schedule. naviswork manage

• TimeLiner: Users can import schedules from tools like Microsoft Project or Primavera P6 and link tasks to model geometry.
• Simulation: The software generates a visual simulation of the construction sequence. This allows teams to verify constructability, optimize site logistics, and ensure that the planned timeline is feasible.
• Safety Planning: By visualizing the sequence, safety managers can identify hazardous zone overlaps during different phases of construction.

Workflow Integration: The BIM Execution Plan

Navisworks Manage operates primarily during the Coordination Phase of a project. A typical workflow involves:

1. Export: Design teams export their native models (Revit, AutoCAD) to Navisworks cache (.nwc) files.
2. Append: The BIM Manager appends these files into a master federated model (.nwf).
3. Setup: Clash test rules are defined (e.g., Fire Protection vs. Structural Framing).
4. Detection: The software runs the clash report, sometimes generating thousands of conflicts.
5. Resolution: The BIM Manager exports clash reports (HTML/BBS views) and sends them to responsible parties.
6. Iteration: Designers fix issues in native models, and the updated files are re-loaded into Navisworks for verification.

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Step 3: Triage and Filtering

You cannot resolve 10,000 clashes. You must prioritize. Navisworks Manage: Ultimate Guide to Model Coordination and

• Tolerance: Set a tolerance (e.g., 2 inches). Ignore clashes smaller than that (these are usually modeling errors or acceptable overlaps).
• Status Management: Change clash statuses to Active, Reviewed, Approved, Resolved, or Ignored.
• Rule-Based Clashing: Set "Clash Rules." For example: "Ducts clashing with sprinkler pipes are critical. Fire alarm wires clashing with lights are minor."

3. 4D Simulation (Time)

Navisworks Manage integrates model geometry with external project schedules (from Microsoft Project, Primavera P6, or Excel).

• Construction Sequencing: Link specific objects (e.g., concrete pours, steel columns) to tasks in the schedule.
• Visual Timeline: Play an animation showing how the building will be erected over days, weeks, or months.
• Phasing Analysis: Identify potential logistical problems, such as cranes blocking material delivery or incomplete foundations preceding structural steel erection.

3. Quantification (Takeoff)

While not a replacement for dedicated takeoff software like Bluebeam or PlanSwift, Navisworks Manage offers a robust Quantification module. This tool allows users to perform "model takeoffs" (counting objects from the geometry) and "paper takeoffs" (measuring 2D sheets). This is vital for contractors who need to verify that the quantity of steel or concrete in the model matches the bid documents. Clash Tests: Users can define rules to detect

4. Quantification (5D Takeoffs)

While not as robust as a dedicated estimating suite, Navisworks Manage includes built-in quantification tools. You can perform automatic and manual counts of objects (walls, doors, pipes) and calculate linear lengths, areas, and volumes directly from the federated model. This helps generate rough order-of-magnitude (ROM) estimates early in the design phase.

4. 5D Cost Estimation

• Budget Integration: Allows users to link model elements to cost data (usually via Excel or database imports) to visualize the financial flow of the project alongside the timeline and geometry.