The thermal and hydrodynamic boundary conditions fixed on the walls of the confinements are assumed under ideal conditions. On the walls of the spherical and hemispherical confinements, a constant room temperature C) is assumed. This condition implies that the confining walls are infinite heat sinks. When the confinement is large and the nanoparticle is distant from the walls, the temperature boundary condition is not consequential. However, for the case of hemispherical confinement and the nanoparticle is close to the bottom wall, an infinite heat sink may reduce the steady state temperature of the nanoparticle significantly. Thus, for this case, adiabatic wall boundary condition i.e. perfect insulation was also investigated for comparison. On the walls of the confinements and nanoparticles, both slip and no-slip boundary conditions were assumed. In reality, the boundary condition are not ideal. Thus, the comparison among these boundary conditions at the extremes provide realistic limits of the temperatures and velocities. For instance, the constant temperature boundary condition on the confining walls provides the minimum velocity and temperature. However, any approach to the opposite "adiabatic" boundary condition only implies higher velocities and steady state temperature of the nanoparticle. The attachment of the nanoparticle to the wall was avoided for the sake of simplification as the presence of the wall will alter the plasmonic behaviour of the nanoparticle. Thus, the results reported herein are not specific to any particular system with specific material properties for the walls.