Computational Methods For Partial Differential Equations By Jain Pdf Best - ((free))
(often co-authored with Iyengar and Jain). It includes updated sections on finite element methods (FEM), which are now standard in modern industry software like ANSYS or COMSOL. A Pro-Tip for Study:
A reliable reference for Master’s and Ph.D. candidates developing custom CFD (Computational Fluid Dynamics) codes.