2.6.5 Under-Relaxation of the Fiber Exchange Terms

Note that the exchange of momentum, heat, and mass from the fibers is under-relaxed during the calculation, so that

where $\alpha$ is the under-relaxation factor for fibers that you can set in the Solution Controls task page. The default value for $\alpha$ is 0.5. This value may be reduced in order to improve the stability of coupled calculations. Note that the value of $\alpha$ does not influence the predictions obtained in the final converged solution.