Summary

This document describes the theoretical basis and validation of the membrane load formulation Regular net in AquaSim. This load formulation is based on the cross-flow principle, where the fluid velocity relative to the membrane panel is decomposed into a normal- and tangential component.

The drag forces are derived based on an effective drag coefficient for the membrane panel. As from AquaSim version provided in 2024 (2.19.0) a revised formulation of the effective drag coefficient is presented.

Revision 3:
Theoretical basis for the Reynolds number-dependent Cd_cyl, oblique flow and shadow effects are included. This information was previously found in (Aquastructures, 2025a).

This document is valid for AquaSim version 2.22.0

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