The submitted master's thesis deals with the implementation of passive flow control on the Škoda Enyaq Coupé to effectively replace the conventional spoiler. The author first analyzed various configurations of the exhaust slot to improve the vehicle's aerodynamic properties. Based on the optimal variant, he subsequently designed and verified several options for the complete implementation of the device, including the design of the air intake and the internal geometry of the duct.

I highly appreciate the overall conceptual design for real-world vehicle integration. The student demonstrated excellent engineering thinking; beyond aerodynamics, he also considered practical structural aspects – particularly reliable water and dirt drainage, as well as the joint connection to the car body. To verify the proposed variants, he utilized advanced CFD tools provided by Škoda Auto. Although the thesis does not address the actual calibration of the computational model, the application of a validated corporate methodology ensures a high level of credibility for the simulations.

Throughout the project, the student worked proactively and entirely independently. He excellently interpreted the obtained data, drew logical conclusions, and proposed his own design solutions. Given the achieved results and the student's outstanding approach, I evaluate this thesis as highly commendable.

Mr. Kozubowski, in the framework of his diploma thesis, carried out an analysis of the implementation of an active flow control device for drag reduction on a Škoda Auto production electric vehicle.

The work has a systematic and logical structure. Following a theoretical introduction that explains the nomenclature and key aspects of automotive aerodynamics, the background of both active and passive flow control approaches is presented.

In the following chapter, the state of the art is analyzed, and a patented drag-reduction device—developed in collaboration between Brno University of Technology and Škoda Auto—is introduced. The main objective of the thesis is then clearly defined as the transfer of this patented solution from a small-class hatchback (Škoda Fabia) to the Škoda Enyaq Coupé electric SUV.

In the subsequent chapters, the student presents the steps involved in the preparation of the computational model and the execution of CFD simulations. The results are discussed from the perspective of vehicle performance, particularly with respect to drag and downforce for the baseline geometry of the Škoda Enyaq.

Next, three different configurations of active flow control implemented on the rear edge of the vehicle body are analyzed, and their results are compared in terms of drag variation as a function of vehicle speed. The configuration with two separate outlets was identified as the most promising candidate.

For this selected configuration, Mr. Kozubowski performed important steps toward assessing its practical implementation. This included the design and optimization of the inlet system (both shape and placement on the vehicle body), as well as the design and optimization of the internal ducting. Based on these modifications, a complete CFD analysis of the updated vehicle configuration was carried out. The student then evaluated and compared the results against both the baseline and production configurations.

Following the selection of the optimal configuration, further analyses were performed addressing practical aspects such as mechanical integration, drainage, debris protection, freezing, and other real-world operational considerations.

The thesis is written in a consistent and clear manner, and the results are of high quality, with strong potential for practical industrial application.

Through this work, Mr. Kozubowski has demonstrated his ability to independently and creatively solve complex engineering problems, as well as his ability to critically assess results and draw meaningful conclusions. Moreover, he successfully collaborated with an industrial partner, Škoda Auto, throughout the course of the thesis.