The flow profile will be the same just that the maximum velocity will be decreased , since there is resistance.

My mesh has a maximum orthogonal quality of 0.56.

But the thing is in FLUENT manual , there is this mention about turbulence and laminar zone. I am pasting the same here in this reply for your reference. I was hoping whether there might be any bug or something , because the turbulence generated has no effect on my heat transfer. Since I am getting the same result for my simulation with and without any turbulence.


Treatment of Turbulence in Porous Media

ANSYS FLUENT will, by default, solve the standard conservation equations for turbulence quantities in the porous medium. In this default approach, turbulence in the medium is treated as though the solid medium has no effect on the turbulence generation or dissipation rates. This assumption may be reasonable if the medium's permeability is quite large and the geometric scale of the medium does not interact with the scale of the turbulent eddies. In other instances, however, you may want to suppress the effect of turbulence in the medium.

If you are using one of the turbulence models (with the exception of the Large Eddy Simulation (LES) model), you can suppress the effect of turbulence in a porous region by setting the turbulent contribution to viscosity, $\mu_t$, equal to zero. When you choose this option, ANSYS FLUENT will transport the inlet turbulence quantities through the medium, but their effect on the fluid mixing and momentum will be ignored. In addition, the generation of turbulence will be set to zero in the medium. This modeling strategy is enabled by turning on the Laminar Zone option in the Fluid dialog box. Enabling this option implies that $\mu_t$ is zero and that generation of turbulence will be zero in this porous zone. Disabling the option (the default) implies that turbulence will be computed in the porous region just as in the bulk fluid flow. Refer to Section  7.2.1 for details about using the Laminar Zone option