underrelax

under- +‎ relax

underrelax (third-person singular simple present underrelaxes, present participle underrelaxing, simple past and past participle underrelaxed)

1. (mathematics) To solve using underrelaxation.
   • 2003, Hazim B. Awbi, Ventilation of Buildings, →ISBN, page 377:

     Because of the inherent non-linearity of the discretization equation it is sometimes necessary to slow down the change in φ from one iteration to the next, i.e. underrelaxing, to avoid divergence to the solution.

   • 2016, Richard H. Pletcher, John C. Tannehill, Dale Anderson, Computational Fluid Mechanics and Heat Transfer, →ISBN:

     With this modification, van Doormal and Raithby reported that it was no longer necessary to underrelax the pressure correction.