Bhoraniya, RameshkumarRameshkumarBhoraniyaSwaminathan, GayathriGayathriSwaminathanNarayanan, VinodVinodNarayanan2025-08-312025-08-312023-01-0110.1007/978-981-19-9574-3_12-s2.0-85150200601https://d8.irins.org/handle/IITG2025/27027This chapter introduces the flow instabilities and their role in the flow transition from laminar to turbulent. How the knowledge of instabilities can help extend the flow’s laminar regime by delaying transition and thus reducing drag, fuel consumption, noise and CO <inf>2</inf> emission. The transition process and different stages of flow transitions are explained for the boundary layer flows. The methods of investigation are also explored in brief.falseBook Chapter219598701-1020230chBook Series0