Preprints
https://doi.org/10.5194/egusphere-2025-2328
https://doi.org/10.5194/egusphere-2025-2328
04 Jul 2025
 | 04 Jul 2025

Improving turbulent airflow direction measurements for fiber-optic distributed sensing using numerical simulations

Mohammad Abdoli, Reza Pirkhoshghiyafeh, and Christoph K. Thomas

Abstract. This study investigates the impact of microstructure geometry on the thermal and turbulence responses of fiber-optic (FO) cables under varying flow conditions and turbulence intensities. The underlying measurement principle is the directionally sensitive heat loss from electrically heated FO cables with imprinted microstructures exposed to turbulent airflows resembling a long hot-wire anemometer. Using the COMSOL Multiphysics 6.0 finite-element software, this study explores a wider range of different configurations of filled and hollow filled-coned microstructures of varying size compared to existing studies. The research identifies optimal combinations which maximize temperature differences (∆T) across FO cables with cones pointing in opposite directions while balancing key design criteria such as sensitivity to wind speed and minimizing the cables’ PVC coverage. We demonstrate that FO cables with hollow-coned microstructures (radius = 24 mm, height = 24 mm, and spacing = 15 mm) outperform their filled-coned counterparts, maintaining ∆T values above 2 K across a broader range of wind speeds and turbulence intensities. Notably, the hollow-cone configuration sustains a temperature difference of up to 0.8 K at a 60(°) wind attack angle. The findings implicate substantial improvements for an optimized FO cable design in atmospheric boundary layer studies, enabling more accurate measurements of wind direction, distributed turbulent heat fluxes, and vertical wind speed perturbations using fiber-optic distributed sensing (FODS). Future work shall validate the findings under field conditions to assess the robustness and real-world applicability of the optimized design.

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Mohammad Abdoli, Reza Pirkhoshghiyafeh, and Christoph K. Thomas

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Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-2328', Livia Rosalem, 25 Jul 2025
  • RC2: 'Comment on egusphere-2025-2328', Anonymous Referee #2, 30 Jul 2025
Mohammad Abdoli, Reza Pirkhoshghiyafeh, and Christoph K. Thomas
Mohammad Abdoli, Reza Pirkhoshghiyafeh, and Christoph K. Thomas

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Short summary
We used computer simulations to improve how fiber-optic cables measure wind direction. These heated cables have small cones attached to sense how air moves around them. We found that hollow cone designs detect airflow more accurately than earlier versions. This helps us better understand air movement near the ground and could improve the physical foundations of weather and climate models.
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