  This study explores the mixed convection of CNT-water nanofluid within a
square cavity containing heated cylinders under the influence of a magnetic
field, focusing on three geometric configurations: a single heated cylinder,
two heated cylinders, and two heated cylinders with a flow deflector. The
impact of various parameters, including Reynolds number (Re), Richardson number
(Ri), Hartmann number (Ha), wavy wall peaks (n), nanoparticle volume fraction
({\phi}), Hartmann angle ({\gamma}), rotational speed ({\omega}), and
inclination angle ({\alpha}), on thermal and fluid dynamic behaviors is
analyzed. Results reveal that MWCNT nanofluids consistently achieve higher
Nusselt numbers than SWCNT nanofluids, indicating superior heat transfer
capabilities. Introducing a second cylinder and a flow deflector enhances
thermal interactions, while increasing Ha stabilizes the flow, improving
thermal performance. Wavy wall peaks further enhance fluid mixing and heat
transfer efficiency. Additionally, SWCNT nanofluids exhibit higher Bejan
numbers, indicating a greater dominance of thermal entropy generation over
fluid friction. These findings provide valuable insights for optimizing thermal
management systems in engineering applications, highlighting the importance of
selecting appropriate nanofluids, geometric configurations, and magnetic field
parameters to achieve optimal thermal performance and fluid stability.
