Question

Along the downwind line of the NVD, the values of _____________ are changed to make the system stable.

(a) ac

(b) (l,k)

(c) Φc

(d) Φf

I have been asked this question in unit test.

My question is from High Resolution Schemes topic in chapter High Resolution Schemes of Computational Fluid Dynamics

Answer 1

Right option is (b) (l,k)

To explain: Along the downwind line of NVD, the values of (l,k)=(0,1), a value of zero is obtained for the diagonal coefficient and the system becomes unstable. To overcome this problem, the values of (l,k) are set equal to (L,1-LΦf). The value of L can be chosen which is usually set to l in the previous interval.