The Full Nonlinear Vortex Tube-Vorton Method: the post-stall condition

TL;DR

This paper extends the Full Nonlinear Vortex Tube-Vorton Method to accurately model post-stall fluid flow, capturing complex wake dynamics without relying on pressure-based calculations, thus simplifying low-speed aerodynamics analysis.

Contribution

It introduces an alternative force calculation method for post-stall conditions within the FTVM, enabling accurate modeling of complex wake dynamics using a low-order vorticity-based approach.

Findings

Successfully modeled post-stall flow with complex wake dynamics

Avoided pressure-based calculations, simplifying analysis

Demonstrated accuracy of low-order numerical method

Abstract

The original concepts behind The Full Nonlinear Vortex Tube-Vorton Method (FTVM) have been applied to the study of massively separated fluid flow past a thin body. In the pre-stall condition, the Kutta-Zhukovski (KJ) force calculation was successfully implemented. However, for the post-stall condition, this approach is not capable of capturing the form drag component. Thus, an alternative force calculation method is implemented. The results obtained demonstrate that the fluid motion involving complex wake dynamics can be accurately approximated by a low-order, low-discretization numerical method based purely on vorticity and velocity concepts. This method avoids the need to discuss and speculate about the role of pressure on fluid motion, even in the turbulent regime. Consequently, it simplifies the understanding of complex low-speed aerodynamics by returning to the first principles.