Question

What is the relation between the E of the E-factor relaxation and the relaxation factor λ?

(a) E=\(\frac{1}{1-\lambda}\)

(b) E=\(\frac{\lambda}{1-\lambda}\)

(c) E=\(\frac{\lambda}{1+\lambda}\)

(d) E=\(\frac{1}{1+\lambda}\)

I got this question by my school teacher while I was bunking the class.

My doubt is from Under-Relaxation in division Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

Answer 1

Right choice is (a) E=\(\frac{1}{1-\lambda}\)

To explain: The relaxation factor is expressed in terms of E factors in the E-factor relaxation. In general, the E factors range from 4 to 10. This range corresponds to the under-relaxation factors of range 0.75 and 0.9.