Comply with IMO EEXI options

Assess EEXI values and corrective options for vessels using CFD-based vessel analysis.

Many vessels may not comply with International Maritime Organization’s (IMO) Energy Efficiency Existing Ship Index (EEXI) requirements and may therefore require corrective measures to remain in operation. Shipowners need to calculate the vessel's current EEXI value, estimate V_ref and assess the effect of power limitation or energy-saving solutions.

Evaluate EEXI measures before physical modifications

CFD calculations can provide a faster, more cost-efficient alternative to towing tank tests and sea trials for evaluating speed-power curves. The analysis can include EPL, ShaPoLi and energy-saving solutions, helping shipowners assess the expected EEXI effect before installation, dry-docking or a subsequent sea trial. The service is part of our expertise area Maritime and offshore engineering, and we also offer to calculate and review vessel emissions and CII.

CFD visualisation of flow patterns around a vessel hull used in EEXI performance analysis and hydrodynamic assessment. — CFD simulation illustrating hydrodynamic flow behaviour used to evaluate vessel performance and EEXI-related corrective measures.

Challenges

When EEXI values are not properly estimated", shipowners may delay corrective action or choose measures with insufficient effect.

Uncertain EEXI values delay corrective action

When the current EEXI value and V_ref are unknown, shipowners cannot determine whether the vessel needs EPL, ShaPoLi, energy-saving devices, or another corrective measure. This can delay planning and make it unclear whether the expected action is sufficient.

Power limitation may affect profitable operation

EPL or ShaPoLi can reduce vessel speed, thereby lowering fuel consumption and emissions, but a longer transportation time can reduce chartering interest and affect the ability to operate the vessel profitably. The expected effect must therefore be assessed before selecting a power limitation.

Early installation can increase cost and effort

Installing energy-saving devices before their expected EEXI effect is assessed can lead to unnecessary dry-docking, installation work and later sea trial activity to determine the exact EEXI value. This creates a risk of spending time and cost before the effect is known.

Benefits

Use CFD calculations to assess EEXI and corrective measures before selecting physical changes

Clarify the vessel's EEXI value

CFD simulations can calculate the vessel's current EEXI number and predict V_ref at the required loading condition. This gives shipowners a technical assessment of the specific values that determine whether corrective action is needed.

Compare power limitation and device options

The simulations can compare the expected effect of EPL, ShaPoLi and selected energy-saving devices. This helps shipowners assess which measures are likely to provide the required EEXI effect before equipment is selected or modifications are planned.

Limit unnecessary testing and installation work

By assessing expected performance in advance, shipowners can narrow down relevant options before dry-docking, physical installation or sea trial activity. This reduces work on options that are unlikely to deliver the required EEXI result.

Clarify options for meeting EEXI requirements

Review your vessel's EEXI value and relevant corrective options using CFD-based analyses of power limitations and selected energy-saving devices.

Service scope

Determine EEXI compliance pathways through performance simulation

CFD calculations establish the vessel's current EEXI value and predict V_ref under the required loading condition. The analysis provides a basis for determining whether corrective measures are needed to achieve the required EEXI performance.

Standards

Technical guidelines and EEXI-related requirements

IMO requires existing vessels to calculate EEXI. The service uses CFD calculations to assess the vessel's EEXI value, predict V_ref and calculate the expected effect of corrective measures.
The CFD simulations follow ITTC guidelines and are validated against benchmark hulls. This defines the technical method basis for the CFD work, not a certification or approval of the vessel.