.TRANSFORM.Fluid.ClosureRelations.PumpCharacteristics.Functions.PerformanceCurve

Information

Pump-characteristic copy of TRANSFORM.Math.PerformanceCurve. See that function for the math, argument meaning and the analytic-derivative pattern.

Both copies must be kept in sync. This local copy exists so that the PumpCharacteristics closure-relation models can reference a function within their own sub-package; the implementation, default for d, and derivative annotation are identical.

Interface

function PerformanceCurve
  input Real x "Value of interest";
  input Real x_curve[:];
  input Real y_curve[size(x_curve, 1)];
  input Real d[size(x_curve, 1)] = TRANSFORM.Math.splineDerivatives(x = x_curve, y = y_curve, ensureMonotonicity = TRANSFORM.Math.isMonotonic(x = y_curve, strict = false)) "Derivatives at the support points (precomputed; default keeps backward compatibility)";
  input Real r_N(unit = "1") "Relative revolution, r_N=N/N_nominal";
  input Real delta = 0.05 "Small value for switching implementation around zero rpm";
  output Real y "Output at x";
end PerformanceCurve;