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 Ata Nutku
Ship Model Testing Laboratory
 The complex covers 934 m2 of floor area and contains a
ship model towing tank with the dimensions of 160 m x 6 m x 3.4 m with
a flap-type wavemaker. There is also a smaller towing tank with the
dimensions of 40 m x 2 m x 1 m, a circulating water channel, a
cavitation tunnel, and a stability tank. There are various workshops
within the laboratory for building ship models up to 4.5 m long, of
either wax or wood using milling machine or cold moulding techniques.
The activities of the laboratory are focused on ship
resistance and propulsion, offshore technology, ship design and
transportation. The main goals include the development of theoretical,
computational and experimental methods and design tools to be used in
ship design and ocean engineering applications. The laboratory provides
consultancy services in maritime technology according to contract rules
of ITU. All contract work is confidential.
Ata Nutku Ship Model Testing Laboratory has a number of
experimental facilities for carrying out research and development in
marine technology, which includes:
· Large Towing Tank
· Small Towing Tank
· Cavitation Tunnel
· Circulating Water Channel
· Stability Tank
· Other Facilities
· Computational Facilities
Large Towing Tank
The large towing tank is equipped with a numerically controlled
carriage, resistance, propulsion and open-water propeller dynamometers
and a wavemaker. Speeds of up to 6 m/s can be achieved. The main
dimensions of the tank are as follows:
Length L= 160 m, Breadth B= 6 m, Depth D= 3.4 m
Ship models up to 4.5 m long are utilized which enables economic and
reliable model tests to be conducted for the majority of current ship
forms. Self-propulsion and wake field measurements are performed to
derive wake quality and propulsion factors as well as standard
resistance tests and open-water propeller tests. High-speed craft tests
are also performed. The wave generator can be utilized to measure
motions of ship models and motions of offshore platforms in regular or
irregular waves. 
Small Towing Tank
The small towing tank with its dynamometer and electronic speedometer
was completely designed at the university and manufactured in Turkey.
In this steel tank, models up to 1.8 m long have been tested at speeds
up to 2 m/s. The small tank system utilized a falling weight
dynamometer operating directly with a wire towing arrangement or a
towing carriage moving on the rails. It has the facility to carry out
ship resistance and special types of hydrofoil sections tests. While
the large tank is exclusively used for the shipbuilding industry
projects and research purposes, the small tank is utilized for the
academic studies and students training in the faculty. The small tank
has a semi-circular cross section and its main dimensions are given as
follows:
Length: L= 40 m, Breadth: B= 2 m, Depth: D= 1 m
Cavitation Tunnel
The cavitation tunnel was designed and manufactured by Kempf-Remmers of
Germany. Partially or totally cavitating model propellers, hydrofoil
sections, wings can be tested for cavitation both in free stream and in
a simulated ship stern wake. All types of profiles can be tested in
this tunnel. Maximum propeller size is 20 cm. in diameter. The
dimensions of large section are 63 x 35 cm.
Circulating Water Channel
The circulating water channel is largely used for flow observations and
specialist tests in steady forward motion under the atmospheric
pressure. The test section of the channel is 1.5 m x 0.75 m and maximum
speed is 2 m/s. The channel is equipped with a mechanical resistance
dynamometer and pitot tubes for velocity measurements. Flow
visualization tests are also frequently performed using wool-tufts and
dye injection.
Stability Tank
Stability dynamometers and orbital wheel equipment are utilized for
investigating stability requirements of various designs.
Other Facilities
The offshore structure and ship models of up to 4.5 m
can be constructed from either wood or wax using semi-automated milling
machine located in the workshop.
Experimental Equipment;
1. 6 component dynamometer
2. Propeller dynamometer for cavitation tunnel
3. Kempf rings for wake measurement
4. Wake rake (pitot rake)
5. Trim-Sinkage measurement (2xLVDT)
6. Propeller dynamometer (self-propulsion)
7. Prandtl tube for cavitation tunnel for speed measurement
8. Open-water propeller dynamometer
9. One component resistance dynamometer
10. Three component dynamometer (Resistance - heave - pitch)
11. Atwood dynamometer (one for large tank and one for circulating
water channel)
12. Wave maker (Flap Type)
13. Wave probes and amplifiers
14. 10 channel strain-gauge bridge balance-amplifier
15. Conductivity meter
16. 4 channel LVDT
17. Pressure transducers
18. A/D Data converters (Computerized data acquisition system)
19. Sailing yacht force measurement dynamometer
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