1. Calculate retardation function Computes the retardation functions and the added mass at infinite frequency from the frequency dependent damping of a radiation data group, and passes the updated radiation data on in the workflow. This is the same calculation SIMA performs when hydrodynamic data is imported from a boundary element solver, exposed as a workflow node so that it can be repeated with other parameters as part of a run. The method, and the effect of the parameters below, is described in Calculation of retardation functions from frequency dependent damping. 1.1. Input Radiation Data — The radiation data group to compute for. Required. Structural Mass — Structural mass of the body. Required when Use Structural Mass is checked, and unused otherwise. Extra Damping — Linear damping matrices to be combined with the damping produced by the calculation. 1.2. Output The output slot carries: totalRadiationData — the radiation data, now holding the computed retardation function and added mass at zero and infinite frequency. retardationFunction addedMassInfinite addedMassZero — taken from the frequency dependent added mass at the lowest available frequency. combinedDamping — only present when something is connected to Extra Damping. 1.3. Parameters Time Step: sampling interval of the retardation functions (s). Default 0.5. Cut Factor: determines the duration of the significant part of the retardation function. A large value means less truncation. Default 200. Power Of Two: the FFT is run over \(2^n\) samples, n being this value. Default 13. Use Structural Mass: when checked, the structural mass is used together with Mass Cut Factor to decide which coupling terms are close to zero for all values of t and can be neglected. Mass Cut Factor: a small value means a larger chance of neglecting a coupling term (only shown when Use Structural Mass is checked). Default 1.0e5. See Post Processor operations Python (SIMAPy)