Never miss a story from Computational Fluid Dynamics (CFD). Subscribe for in-depth analysis and articles.
As kids, we enjoyed making paper boats, watching them float along a water channel, and during the rainy season, puddles of water would be the water basin for our boats to float on. The make or the design of the paper boat determined how long or how much of the natural forces it could withstand. Similarly, by towing a ship model into a humongous basin of water, naval architects can identify and understand the different factors that contribute to the seakeeping, maneuvering, and icebreaking capabilities of the ship.
Traditional towing tanks are large pools of water several hundred meters long or experimental facilities that take the shape of a swimming pool. These towing tanks have propelled the science of ship design, providing insights into ship hydrodynamics in different seawater conditions. The rudimentary practice of testing a ship design is to tow the model into a water tank using a towing mechanism and measure the force on the model during the process. William Froude, back in 1870, felt the need for a towing tank to study and predict the ship resistance; this opened doors to advanced towing tanks that naval architects in the marine industry widely use now.
For accurate measurements, it is essential for the towing tank to be built inside a climate-controlled building because a slight temperature change can tamper with the results. The towing carriage used for towing the ship is a large movable platform that stretches across the tank, has sensors equipped on them, and can hold a few scientists, those working closely on the ship design results. The model to be towed is often placed in the middle of the carriage. Towing tanks used for studying ship hydrodynamics are like wind tunnels used for aerodynamic testing of vehicles.
There are three tests carried out for the power prediction of a ship, and they are:
Although towing tanks were initially designed for single testing purposes, i.e., ship resistance tests, as the design of ships progressed over time, the need for advanced towing tanks was realized. Today the towing tanks can perform a meticulous list of tests providing measurements close to real-life sea scenarios with expensive and advanced data-acquisition systems installed on the carriage. The three advanced towing tank tests include:
Cadence Fidelity Marine CFD simulation comprises dedicated, virtual naval architecture and marine design tools that function as a virtual towing tank, offering easy-to-use, scalable, highly automated optimization processes and unparalleled free surface modeling. Solve and optimize propulsion, resistance, seakeeping, wind studies, and maneuvering in your designs through our dedicated workflows and team. Equip yourself with the utmost accuracy and efficiency with Cadence CFD solutions.
With constantly changing sea, transport, loading, and racing conditions impacting the ship design performance, hundreds or even thousands of simulation runs may be required to finalize a design and to feel confident about the accuracy of the results. Hence, automation is crucial for minimizing turnaround time without compromising the accuracy of the results. Our solutions have automation for resistance at low and high Froude numbers, seakeeping, (self-) propulsion, trim optimization, open water propellers, and many other facets of ship CFD analyses. Our team of naval engineers has worked closely with our customers to create dedicated automation workflows. Whether you are deep in an America’s Cup or Vendee Globe campaign or are working to reduce drag and improve the propulsion efficiency of ships, you can trust our automated capabilities to provide optimal results with accuracy and speed.
To learn more about Cadence Fidelity Marine CFD, request a demo by clicking the button below -