PAFEC-EHL 2.2 - Functional Overview

  • Mass continuity in the fluid film based on Reynolds equation with an implicit time integration scheme giving a formulation in pressure and journal articulation.
  • Range of linear and quadratic triangular and quadrilateral fluid element types.
  • Arbitrary spatial discretisation of the fluid film and structural housing surface.
  • Inclusion of inertia or other (non-fluid) loads in the bearing housing deformation at each time step.
  • Arbitrary specification of the initial clearance over the fluid film.
  • Time dependent specification of journal translation and tilt or applied forces and moments.
  • Rotating pressures simulating journal oil supply.
  • Mass conserving and quasi-static cavitation algorithms. Sommerfeld boundary conditions also available.
  • Stochastic or general 3D surface roughness.
  • Variable fluid viscosity.
  • Solution of the coupled Reynolds and journal equilibrium equations using Newton-Raphson techniques which accurately determined Jacobian matrices.
  • Equation solution options for the full non-symmetric equations (Gaussian or LU reduction) or sparse frontal solution for rigid housings.
  • Flexible control of the incremental/iterative solution including cyclic convergence.
  • Full solution restart capabilities.
  • Output of pressures, film thicknesses and housing deformations to neutral format nodal result files or IDEAS universal file.
  • Summary of key bearing performance indicators for the last converged cycle including friction, side flow, power loss etc.
  • Film pressures projected onto the bearing surface for stress analysis of the housing.