Increase performance
in thruster tunnels and
save energy

Elogrid

New grid design for thruster openings is developed with purpose to reduce the additional resistance from the tunnels in sea service and improve the thrust forces induced by the propeller when maneuvering.

The additional resistance is decreased in principal by similar manner with vertical grids, the turbulence length scale at ship service speed with boundary layer development speed determines the distance of the plates needed to prevent main bulk flow entry into the tunnel surfaces. Most of the tunnel resistance is developed by pressure forces contributed by the flow caught into the tunnel.

Thrust forces are increased using grid stator effect. The propulsion induce swirl with higher circumferential velocity, and using these stator blades this velocity is decreased and aligned more axial. Same time with reduced velocity static pressure is elevated meaning improved thrust forces to the ship hull.

Instead of causing forces to opposite direction with propulsion the ELOGRIDs are designed to produce thrust forces to same direction with propulsion. That is possible with radial blade profiles designed to perform as blades keeping the boundary layer attached on the blade suction side.

Viking Line
“After installation of Elogrids I really feel the difference in lower vibrations at deck already during the testing. The maneuvrability of the vessel is clearly improved compared to original. I would have not expected to notice such significant effect. The personnel I have met from Elomatic have all been true professionals.”

- Captain Mr Tomas Karlgren at Viking Line

Results with insight

  • Cost-efficient analysis of existing tunnels and evaluation of potential for performance upgrade
  • Methodical approach with quick results
  • Guaranteed delivery time
  • Broad simulation expertise with global service
  • Optimized grid design recommendations and approval authority documentation

Download Elogrid Webinar

The key phases of the project

Select

1. Select

Based on your schedule and design requirements, select a suitable Elomatic service package.

Define

2. Define

Send your drawings and extra equipment information (e.g. propeller) to Elomatic and let us do the simulation.

Design

3. Design

We will deliver a 3D model and a report evaluating your design and include our suggestions (if applicable).

Deliver

4. Deliver

You can deliver the drawings and instructions to the yard authorities and include the results in the ship’s documentation.

Delivery in four (Fastlane) or eight weeks (Light, Full)

Standard or custom evaluation for all designs

We will manage design specifications directly with thruster pod/propeller manufacturers if needed.

We will use default values (“stock propellers”) for equipment with no design available.

Light

For designs requiring thrust force analysis only

Full

For typical designs with both added resistance and thrust force analysis

Fastlane

For companies requiring quick delivery, e.g. for drydock in few weeks

Delivery time for evaluation and design optimization 6 weeks 8 weeks 4 weeks
Documentation
Thrust force analysis and ELOGRID optimization
Added resistance analysis and ELOGRID optimization

Standard or custom delivery for all designs

We will manage design specifications directly with thruster pod/propeller manufacturers if needed.

We will use default values (“stock propellers”) for equipment with no design available.

Light

For designs requiring thrust force analysis only

Full

For typical designs with both added resistance and thrust force analysis

Fastlane

For companies requiring quick delivery, e.g. for drydock in few weeks

Delivery time for evaluation and design optimization 6 weeks 8 weeks 4 weeks
Documentation
Thrust force analysis and ELOGRID optimization
Added resistance analysis and ELOGRID optimization
Design for manufacturing and instructions for mounting*
Manufacture supervising*

*case dependent, offered separately

What’s in it for you?

  • Fuel savings contributed by reduced additional resistance from the tunnels
  • Increased thrust capacity from grid stator effect
  • Improved propeller efficiency provides reduced noise when thrusters are used
  • Transparent design audit trail
  • Manufactured in Finland and installed globally by yard under Elomatic’s supervision
Juha Tanttari

Juha Tanttari

Lead Consulting Engineer - Technical Analysis

M.Sc , Mech. Eng. - Juha Tanttari has more than 20 years' experience of working in fluid dynamics consulting. His experience covers a vast range of industrial segments including marine hydrodynamics and aerodynamics, project management and sales.

Juha joined Process Flow in 1999, which was acquired by Elomatic in 2017. He currently holds the position of Lead Consulting Engineer, Technical Analysis.

+358409004598
juha.tanttari@elomatic.com