Analysis of the Natural Convection Flow in the Upper Plenum of the MONJU Reactor with Trio_U

Table 3

Fundamental numerical scheme used in the Trio_U calculations.

General	Dimension	3D calculation
	Fluid	Sodium at 400°C
	Mesh	Tetrahedral mesh
	Discretization	P0/P1 for 𝑃; P1NC for 𝑈,𝑇,𝑘,𝜀
Time scheme		1st order Euler explicit
Navier-Stokes; equations	Convection	2nd order upwind
	Diffusion	2nd order centred
	Pressure solver	Cholesky method
	Thermal effects	Boussinesq hypothesis
	Wall law	Logarithmic wall law
	Turbulence	RANS
Turbulence; modelling	Turbulence model	High Reynolds 𝑘-𝜀
	𝑘, ε convection	2nd order upwind
	𝑘, ε diffusion	2nd order centred
Energy transport; equation	Convection	2nd order upwind
	Diffusion	2nd order centred
	Wall law	Logarithmic wall law
	Turbulence	Turbulent Prandtl Number Pr𝑡