Resolvent Analysis Of Laminar Separated Flows Over Swept Wings*

\sout{\textsc{WE STUDY LAMINAR SEPARATED FLOWS OVER SPANWISE-PERIODIC SWEPT WINGS AT HIGH ANGLES OF ATTACK USING RESOLVENT ANALYSIS. THREE-DIMENSIONAL POST-STALL FLOW PHYSICS OF SWEPT WINGS REMAINS LARGELY UNEXPLORED. WE USE RESOLVENT ANALYSIS TO GAIN INSIGHTS ON THE BEHAVIOR OF COHERENT STRUCTURES AND AMPLIFICATION MECHANISMS AS WE VARY THE SWEEP ANGLE, STROUHAL NUMBER, SPANWISE WAVENUMBER, AND ANGLE OF ATTACK. ADJOINT-BASED PARAMETRIC SENSITIVITY ANALYSIS IS LEVERAGED TO SPAN THE PARAMETER SPACE FOR DIFFERENT SPANWISE WAVENUMBERS AND STROUHAL NUMBERS. AT THE ZERO SPANWISE WAVENUMBER, THE RESOLVENT GAIN PEAK IS FOUND TO ALIGN WITH THE DOMINANT SHEDDING FREQUENCY. IN THIS CONFIGURATION, AN INCREASE IN SWEEP ANGLE IS SHOWN TO REDUCE THE RESOLVENT GAIN. AT THE NON-ZERO SPANWISE WAVENUMBERS, INCREASE IN SWEEP ANGLE SHIFTS DOMINANT GAIN TO HIGHER FREQUENCIES. FOR THE SWEEP ANGLE OF 45}}\sout{$^{\mathrm{O}}$\sout{\textsc{, 3D MODES ARE AMPLIFIED MORE THAN 2D MODES. THE PRESENT STUDY SERVES AS A FUNDAMENTAL BASIS TO REVEAL UNIQUE WAKE DYNAMICS SEEN FOR SWEPT WINGS.}}