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Data center CFD and thermal engineering

Computational Fluid Dynamics (CFD) gives engineering teams visibility into airflow and thermal behavior that ASHRAE, ACCA or rule-of-thumb methods cannot capture. It shows how a facility actually performs under real loads, equipment layouts, outdoor conditions and failure scenarios so you can make correct decisions before construction, commissioning or downtime costs money.

As the industry’s focus on energy efficiency intensifies, metrics such as Power Usage Effectiveness (PUE) have become baseline indicators. CFD enables significant improvements in PUE by optimizing cooling infrastructure, reducing fan and chiller energy, and resolving thermal inefficiencies early in design or operations.

Modern data centers behave as interconnected cooling ecosystems. Airflow in the data hall interacts with containment performance, CRAH and CRAC control strategies, plenum behavior, heat-rejection equipment, external wind conditions and even short-break power events. Understanding these interactions as a whole system is essential for achieving predictable thermal performance and improving PUE.

Below are some of the key services we provide in the data-center sector.

Internal data hall cooling & airflow CFD

What we solve:

• High-density and AI compute racks with extreme heat output
• Hot-aisle and cold-aisle containment failures and airflow bypass
• Under-floor plenum and overhead duct distribution inefficiencies
• CRAH/CRAC loading imbalance, unit undersizing or oversizing
• Recirculation, cold-air starvation, dead zones and humidity risks
• Hidden pressure gradients, dew-point and condensation issues
• Rack-to-rack thermal imbalance, hotspots and short-term thermal excursions

What we deliver:

• Rack-level and room-level thermal CFD and flow modelling (digital twin-ready)
• Containment optimization, leakage paths and air-sealing analysis
• CRAH/CRAC placement, load-balancing and control-strategy modelling
• Under-floor plenum modelling for tile strategy, damper settings and airflow optimization
• Humidity, condensation and pressure-cascade analysis
• Virtual commissioning support, enabling simulation of control sequences and system startup prior to physical build
• Clear performance-based recommendations that reduce commissioning time and accelerate ramp-up

Outcome:

Stable inlet and rack temperatures, higher allowable IT density, fewer hotspots, more predictable operations and tangible PUE improvements.

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External heat rejection & campus-wide airflow CFD

Outdoor airflow and site layout often undermine cooling-plant performance without being obvious at design stage. Wind, terrain, roof-mounted equipment and exhaust paths can drive recirculation, degraded ΔT (delta-T) and reduced cooling-efficiency-a direct factor in PUE impact.

What we model:

• Cooling-tower and chiller recirculation risk, ponding and exhaust plume interaction
• Generator exhaust and heat-rejection equipment interactions and plume effects
• Building aerodynamics, siting, wind-effects and terrain influence on airflow
• Rooftop-airflow interactions and screening strategies for roof-mounted plant
• Heat-island effects, campus-scale airflow modelling using 3D CFD and depth-averaged methods

What we deliver:

• Exhaust-plume dispersion and air-intake recirculation maps
• Chiller and cooling-tower layout sensitivity to wind, discharge height and screening
• Yard and roof mitigation options (recirculation covers, screens, deflectors, intake distance)
• Intake-air protection strategies for high-reliability sites
• Visualisations and performance documentation fit for MEP coordination and permitting

Outcome:

Fewer overheating events, improved cooling-plant performance, better ΔT on chillers, more stable supply temperatures and lower cooling-energy consumption contributing to enhanced PUE.

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Short-break & thermal ride-through modelling

Power transitions, cooling interruptions, UPS bypass, and system restarts expose thermal vulnerability that steady-state design methods often overlook. Understanding transient behavior is now essential for mission-critical facilities hosting high-density loads. We utilize the industry standard Flownex 1D system modelling tool for this.

We simulate:

• UPS transfer delays and sequence timing
• Cooling-plant restart timelines, staged recovery and partial-cooling scenarios
• Load-transient behavior in containment and hall systems
• Full-outage recovery modelling and ramp-up performance

We quantify:

• Cold-aisle temperature rise versus time during outages
• CRAH/CRAC response, supply-air stability and pressure-cascade behavior during restart
• Maximum allowable duration before IT inlet temperature or equipment limits are exceeded
• Virtual commissioning of control-logic and system sequence validation prior to physical installation

Outcome:

A clear, time-based understanding of thermal resilience and system robustness – supporting uptime guarantees, design margins, and operational readiness.

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Design validation, permitting & compliance

CFD supports:

• Equipment right-sizing and mechanical-system verification
• Vendor coordination and workflow integration
• Justification for high-density deployment and reliability-critical installations
• Documentation for permitting related to airflow, plume dispersion and heat-discharge
• Virtual commissioning of systems for early validation of sequences, controls and integration
• Risk-assessment and compliance support for uptime, safety and energy-efficiency goals

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When to use CFD?

Use CFD when you need to:

• Resolve hotspots, airflow imbalance or containment failure
• Add high-density or high-power equipment late in design
• Validate a mechanical or containment redesign and associated control strategy
• Control humidity or prevent condensation or dew-point failure
• Analyze ride-through and short-break performance
• Reduce energy consumption, fan power or cooling-plant load
• Improve PUE, avoid costly retrofits or solve operational cooling surprises

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Why clients choose Navier?

• Decades of mission-critical airflow, thermal- and cooling-plant expertise
• Results-driven engineering with no unnecessary simulation padding
• Fast turnaround and direct technical communication with senior analysts
• CAD-ready deliverables for MEP integration, thermal-map reports and control-logic validation
• Trusted by operators, EPC firms and engineering consultants
• Solutions that reduce downtime risk, improve reliability and lower operational cost

Modern data centers demand predictable cooling performance, even under rapidly changing IT loads, equipment upgrades or power-transition events. CFD, combined with system-level thermal modelling, provides the insight needed to design, validate and operate facilities with confidence. Whether you are troubleshooting persistent hotspots, assessing external heat-rejection behavior or validating short-break resilience, Navier delivers clear engineering guidance that reduces risk and improves operational efficiency.