Evaluation of hot-wire measurements in wall shear turbulence using a direct numerical simulation database

Suzuki, Yuji; Kasagi, Nobuhide

doi:10.1016/0894-1777(92)90057-c

Cited by 48 publications

(32 citation statements)

References 18 publications

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“…They found that even this small separation led to a substantial overestimation of the v-component variance near the wall. Suzuki and Kasagi (1992) also synthetically studied the effect of X-array sensor separation using the response to a DNS database of a turbulent channel flow at R,(=-u~f/v) = 150, where u, is the friction velocity and 6 is the channel half-width. Near the wall they found r.m.s.…”

Section: Introductionmentioning

confidence: 99%

The influence of instantaneous velocity gradients on turbulence properties measured with multi-sensor hot-wire probes

Park

Wallace

1993

Experiments in Fluids

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The necessary assumption that the instantaneous flow field seen by hot-wire probes with two or more sensors is uniform, i.e. that all sensors are cooled by identically the same instantaneous velocity field, is often quite erroneous in highly sheared turbulent flow, such as near the wall in a turbulent boundary layer. Intense local shear layers occur, resulting in large instantaneous velocity gradients across the sensing volume of the probe. The effects of these neglected velocity gradients on the ability of a four-sensor probe, consisting of a pair of orthogonal X-arrays, to measure the three velocity and the streamwise vorticity components is assessed. This is done by determining the synthetic response of the probe to the turbulent boundary layer database of Balint et al. (1991), in which all the velocity gradients are known. The effects of neglecting the binormal components of velocity which cool each sensor are also assessed, when the probe is treated as two uncoupled X-arrays. A small improvement to the probe's coupled X-array response is found when an estimate of the mean wall-normal velocity gradient is incorporated in the response equations.

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Section: Introductionmentioning

confidence: 99%

The influence of instantaneous velocity gradients on turbulence properties measured with multi-sensor hot-wire probes

Park

Wallace

1993

Experiments in Fluids

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“…The probe is somewhat idealized in that its disturbance on the flow and the response to the parallel velocity component are neglected. Similar approaches were previously adopted in [16] and [21] for the channel flow, with particular attention to the variance of the velocity fluctuation and of its derivative (in a view to estimate the mean energy dissipation rate). To date, there is no parallel analysis for isotropic turbulence.…”

Section: Introductionmentioning

confidence: 99%

Velocity derivative skewness in isotropic turbulence and its measurement with hot wires

2008

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We investigate the effect of the hot wire resolution on measurements of the velocity derivative skewness in homogeneous isotropic turbulence. A single wire configuration (with different lengths and temporal sampling resolutions) is considered. Estimates of the attenuation, based on numerical data in box turbulence, are applied to experimental data taken in grid turbulence. It is found that the sampling resolution has a sizeable attenuation effect, while the length of the wire has a relatively minor impact. The corrected experimental values support the conclusion that the skewness is constant with the Reynolds number, in agreement with Kolmogorov's 41 theory.

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“…Moin and Spalart (1989) and more recently Suzuki and Kasagi (1990) have investigated the accuracy of hot-wire measurements, hypothesizing that a conventional X-probe is placed in a wall turbulent flow generated on a computer by means of direct numerical simulation technique. In particular, the latter authors have demonstrated clearly that the turbulent intensity normal to the wall is increasingly overestimated near the wall when the wire separation increases, which is in good agreement with the present estimation.…”

Section: Errors In Conventional X-probe Measurementsmentioning

confidence: 99%

“…Hitherto, the errors due to the rectification and the influence of the w-component of the velocity field have been intensively studied (e.g., Tutu and Chevray 1975;Kawall et al 1983;Swaminathan et al 1986). However, there is only little work on the influence of the differences between the velocity fields at the z-locations of the two wires of an X-probe upon measurement of turbulent statistics (Wyngaard 1968;Bremhorst 1972;Browne et al 1988;Suzuki and Kasagi 1990). Tsuji and Nagano (1989) also investigated measurement errors of an X-probe in conjunction with V-shaped hot-wire anemometry (Hishida and Nagano 1988 a, b) in cases where an effect of spatial difference in an instantaneous velocity field is small.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of X-probe response to wire separation for wall turbulence measurements

Tagawa

Tsuji

Nagano

1992

Experiments in Fluids

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Inevitable errors in X-probe measurement are investigated in simulated Gaussian velocity fields generated on a digital computer. Two types of X arrangement are studied: one is a conventional X-probe comprised of two inclined hot wires, and the other consists of inclined and normal hot wires (modified X-probe). The computer simulation results under typical wall-turbulence conditions indicate that the most significant factor producing measurement errors, in both high and low intensity turbulence, is the difference between the instantaneous velocities sensed by the two wires, associated with wire separation. In particular, the measurement accuracy of the modified X-probe depends greatly on the effect of wire separation, and at worst, data obtained with such a probe result in fallacious information. To confirm the error analysis, turbulent quantities in a pipe flow were measured using these X-probes. The experimental results are consistent with the results of the error analysis. Also, based on the present analysis, simple formulae have been developed to estimate inherent errors in X-probe measurements.

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Evaluation of hot-wire measurements in wall shear turbulence using a direct numerical simulation database

Cited by 48 publications

References 18 publications

The influence of instantaneous velocity gradients on turbulence properties measured with multi-sensor hot-wire probes

The influence of instantaneous velocity gradients on turbulence properties measured with multi-sensor hot-wire probes

Velocity derivative skewness in isotropic turbulence and its measurement with hot wires

Evaluation of X-probe response to wire separation for wall turbulence measurements

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