Table 2 The total candidate features

q₁-q₄

Velocity gradient

u_x, u_y, v_x, v_y

q₅

Projection of free stream to normal direction of streamline

sgn(y)[−v + u tan(α)]

q₆-q₇

Pressure gradient

p_x, p_y

q₈

Redefined entropy

S ' /Ma²

q₉

Pressure gradient along streamline

\( {u}_i\frac{\partial p}{\partial {x}_i} \)

q₁₀

Eddy viscosity expression for the inner layer

l_mix²w

q₁₁

Velocity magnitude

\( \sqrt{u^2+{v}^2} \)

q₁₂

Velocity direction

arctan[sgn(y)v/u]

q₁₃-q₁₄

Velocity component

u, v

q₁₅

Density

ρ