These are streamwise velocity time series measured in the wakes of a non-shedding porous disc, referred to as M, next to different solid discs that do exhibit vortex shedding. Data was obtained by means of hot-wire anemometry in the Large Scale Wind Tunnel at the Norwegian University of Science and Technology in near-laminar inflow (background turbulence intensity of approximately 0.3%) at an inflow velocity of 10m/s (diameter-based Reynolds number 125000 for a diameter D = 0.2m).

Three sets of experiments were run and are included in this data set:

1. Span-wise measurements at 8D downstream of the different solid disc and the M disc (singe disc setting) are provided. Measurements downstream of the single non-shedding M disc are included here for convenience, but they also have been published here: Hearst, R. Jason; Berstad, Fanny Olivia Johannessen; Neunaber, Ingrid, 2025, "Replication Data for: Wake merging and turbulence transition downstream of side-by-side porous discs", https://doi.org/10.18710/XAEWC5, DataverseNO, V1

2. The M disc was placed next to solid discs of three different diameters, D = 0.20m, D_17 = 0.17m and D_10 = 0.10m, referred to as S200, S170 and S100, respectively, that exhibit vortex shedding at different shedding frequencies. The spacing was 2D center-to-center. Span-wise profiles were measured at 8D downstream for each case.

3. The M disc was placed next to a solid disc of the same diameter, D = 0.2m, referred to as S200, that exhibits vortex shedding. One spacing, namely 2D center-to-center, was investigated. A streamwise profile between the discs was obtained. This measurement was carried out with multiple single wires, and we include the data of the wire at the inner corner of the M disc, and the wire at the inner corner of the S200 disc, i.e., the cases used in this manuscript.

The scope of these experiments was to study how the ``dead" wake of a non-shedding disc interacts with a wake with a dominant frequency coming from a shedding disc.

The data presented here are single wire hot-wire data obtained in the recirculating wind tunnel at the Norwegian University of Science and Technology. The hot-wires, 55P01 gold-plated wires with a sensing element length of 1.25 mm, were operated using a Dantec Dynamics StreamLine Pro Constant Temperature Anemometer. The sampling frequency was 75047 Hz, and a 30000 Hz hardware low pass filter was employed. The acquisition time was 180 s. An automated traverse system was used to move the hot-wires through the wind tunnel. Three disc types were used, a mesh disc (diameter D = 0.2 m), referred to as type M, with uniform blockage; and three solid discs with different diameters, D = 0.20m, D_17 = 0.17m and D_10 = 0.10m, and thus different shedding frequencies, referred to as S200, S170 and S100.

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