Dan Hanningson, Royal Institute of Technology (KTH)

You've been working with Brazilian researchers at ITA for almost two years. What are their first impressions? What were the main difficulties when starting academic work in another country?

The Brazilian teachers I work with at ITA are extremely competent and very easy to interact with. They have made the process of initiating collaboration exceptionally easy. I've made eight visits to Brazil in the last four years. At the beginning, to identify who to work with, and after the chair started, [I began to carry out] more organized visits to search for common projects. The administrative process in the two countries took some time, but with the help of the CISB, which was always very useful and flexible, there were no major difficulties.

What do you consider your main achievements so far?

The main achievement so far is that we have several postgraduate students at ITA and KTH who are working together on common projects that deal with laminar flow control and turbulent boundary layer flow characteristics . Several students and teachers from Sweden have visited the ITA and vice versa, and now there are several joint publications. A particularly interesting interaction is the experiment in progress regarding laminar flow control of a wing manufactured by Saab AB, which were first studied in a wind tunnel in KTH and have now been transported to Brazil where advanced flow control algorithms will be used in conjunction with sensors and actuators to maintain laminar flow.

When you came to Brazil, laminar flow control had not yet received much attention from Brazilian researchers. In your opinion, how did your presence contribute to developing this area? Is your work in this area successful?

We rely on several years of experience in the use of theoretical control methods for the active control of perturbations in boundary layer flows and we have begun collaborative work on how to use these methods to control disturbances in boundary layers subject to free flow turbulence. The ITA researchers had already used different methods and our work was truly complementary, adding to each other as we combined skills. Using some of the common approaches developed, we were able to solve problems that would have been much more difficult on our own.

Brazilian researchers plan to establish a joint research group based at the SARC. In your opinion, how is the center contributing to the cooperation of aeronautical researchers in Sweden?

The SARC Center (www.sarc.center) is a network of aeronautical researchers in Sweden, and SARC activities contribute to research collaboration both in terms of opportunities for researchers and undergraduates to meet and spend time together during summer school courses. SARC is also involved in raising awareness about the needs of aeronautics researchers in government research agencies. A similar center in Brazil would also be very positive for Brazilian researchers and, from the SARC’s point of view, we would be very happy to make any contribution to make this center real.

What are your main challenges and plans for the next two years of work in Brazil?

Finalize the experiments and experimentally verify the control methods for the more complicated cases of boundary layers under free-flow turbulence. Ensuring future funding for collaboration is also very important.