Our laboratory is one of the best-equipped facilities of its kind covering a floor area of some 3000 square meters
The Hydrodynamics Laboratory is located in the basement of the Civil Engineering Building on the South Kensington Campus of Imperial College and has a tradition of excellence in wide-ranging areas of fluid mechanics with civil and environmental engineering applications.
Available laboratory facilities
The Hydrodynamics Section laboratory is equipped with the facilities to measure waves and their impact. Experiments in a 2D environment can be undertaken in a number of wave flumes. All wave flumes are fitted with a modern active-absorption control system, enabling the realistic representation of ocean wave spectra.
The ocean basin at Imperial College London is the largest research only facility in the UK and measures 20m by 12m. This facility has a maximum operational water depth of 1.2m yet can accurately model both deep and shallow water marine environments through use of an adjustable bed system. The wave-generation process is controlled through a bank of 56 numerically controlled flap-type wave paddles. These paddles allow state-of-the-art experimental conditions to be generated, including directional sea states with frequency dependent spectra. For specialist purposes, the centre of the basin has a 3.5m deep core measuring 1.2m by 1.2m– ideal for modelling catenary moorings and other deep water operations.
Towing tank/ Wide wave flume (Long flume)
This 1.25m deep, 2.8m wide and 62m long facility has recently been refurbished with four new flap-type wave paddles. Like the other flumes, the paddles are entirely computer controlled, allowing the generation of large, high quality, unidirectional regular and random waves. The comparatively large size of the flume makes it ideal to undertake experiments on wave energy devices and other floating structures – such as offshore wind turbines – at scales of approximately 1:60. Furthermore, a rail-mounted carriage is installed above the flume and can be used to tow objects – this is particularly valuable when examining effects such as the wake developed behind a moving body.
Wind-wave-current flume (Coastal flume)
The Coastal Flume at is a 23m long, 0.6m wide facility, designed to reproduce shallow- and intermediate-depth waves. A piston-type wave maker, operational depth 0.5—0.7m, is capable of generating shallow water waves with user-controlled input steepness. These wave groups are then absorbed by a tailored parabolic beach. Present research focusses on input optimisation for wave generation, predominantly related to near-shore, coastal applications such as wave-energy conversion, sediment transport and infrastructure design. Furthermore force-control can be applied to absorb waves, including those in the deep water regime.
Wind-wave-current flume (Double-ended tank)
The wind-wave-current flume is a particularly unique facility, with wave boards located at opposing ends of the 27m long tank. These wave boards are fully numerically controlled and operate using state-of-the-art force feedback. As such, these paddles can absorb and generate wave energy; making it a novel facility for the study of wave power take-off. In addition to the wave generation and absorption facilities, this tank is also capable of simultaneously generating wind and currents. The former driven by a special enclosed turbine that allows wind currents to propagate over water-air interface inside the enclosed flume. This facility has been instrumental in much of the groups work relating to extreme ocean waves, wave-current interactions and wind-wave interactions.
Current flume (4ft flume)
In contrast to many current flumes, this facility in the Hydrodynamics Laboratory is continuously fed to reduce the turbulent kinetic energy of the flow. This gives the researcher the flexibility to create the flow conditions they require, a recent example being the introduction of a bed structure to create realistic oceanic turbulent kinetic energy for a tidal turbine investigation. The flume has a variable width, adjustable in 0.3m intervals up to a maximum 1.2m and a working length of 2.4m. The combination of the width, volume and a maximum flow rate of 0.3m³/s allow for full flow-depth control.
Wave evolution flume (Wall mounted flume)
The primary purpose of the Wave Evolution Flume is to examine the properties of waves as they propagate from deep water into shallow water. To achieve this, the 60m long, 0.3m wide flume is currently equipped with 1:100 beach to provide a water depth of 0.5m to 0m. Pressure transducers are installed in the moveable bed to provide further insight. Glass walls to allow visual access for techniques such as particle image velocimetry. Similar to the other flumes the laboratory, the waves are generated using a force-controlled flap-type wave maker. The research undertaken in this flume is particularly useful for predicting near-shore wave conditions for wave energy conversion and other infrastructure.
Wide flow tank for transverse and oscillatory flow research [currently under construction]
The new tank has been designed to include the ability to (a) create a large volume still-water tank; (b) to create steady-flows across the entire tank width and (c) to create superimposed oscillatory flows using a motion apparatus. Internal tank dimensions will be 26.9m long, 6.2m wide, and 1.3m high, with a max water depth of 1.2m.
Wave flumes and wave basin
|Double-ended wave and current flume||27m||0.3m||0.7m|
|Large wave flume||55m||2.6m||1.2m|
|Wave evolution flume||60m||0.3m||Sloping 1:100 from 0.5 to 0|
|Multidirectional wave basin||12m||20m||0.8m - 1.5m|
The section is involved in a number of teaching activities. To help understanding of complicated problems, the section runs demonstration labs to give students a visual understanding of the problems they are trying to solve.
Teaching demonstration equipment
This has a wide range of flumes, Ahlborn tanks, flow visualization tanks, and pipe flow experiments that are used to demonstrate basic principles in Fluid Mechanics to the undergraduate engineers.