Assuming a convection-diffusion problem where the velocity is in the positive direction (to the right side). Using the upwind scheme:

Question

Answer

ϕ w = ϕ P   and   ϕ e = ϕ W {"version":"1.1","math":"\phi_w=\phi_P~ 	ext{and} ~\phi_e=\phi_W"}

Answer

ϕ w = ϕ W   and   ϕ e = ϕ P {"version":"1.1","math":"\phi_w=\phi_W~ 	ext{and} ~\phi_e=\phi_P"}

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ϕ w = ϕ E   and   ϕ e = ϕ P {"version":"1.1","math":"\phi_w=\phi_E~ 	ext{and} ~\phi_e=\phi_P"}

Answer

ϕ w = ϕ e = ϕ W {"version":"1.1","math":"\phi_w=\phi_e=\phi_W"}

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