Correction: Persoons, T.; Cressall, R.; Alimohammadi, S. Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data. Actuators 2018, 7, 67

The authors wish to make the following corrections to this paper [1] in Section 2.2, Equation (19). The authors wish to replace:

Alternatively, the following equation is an empirical fit for $\beta$ that is valid for $1<a<50$ and $k{A}_n^{1/2}<0.886$ with a mean error of 1.7% and a maximum error of 5.9%:

$$\begin{gathered} \beta \approx -0.34064+6.6771\times {10}^{-2}k{A}_n^{1/2}+1.5318\times {10}^{-4}{a}^2+2.7233\times {10}^{-8}{a}^4 \\ +0.78343\exp \left(-1.7384\times {10}^{-2}a\right) \end{gathered}$$

(19)

While Equation (19) is only valid for aspect ratios not exceeding 50, the value of $\beta$ from Equations (16)–(18) in the limit for infinite aspect ratio ($a\to \infty$) is zero.

with:

Alternatively, the following equation is an empirical fit for $\beta$ that is valid for any aspect ratio $a\ge 1$ and $k{A}_n^{1/2}<0.886$, with a mean error of 1.9% and a maximum error of 7.9% for $1<a<50$:

$$\beta \approx 0.5316\exp \left(-0.181a^{0.44}\right)-0.05247k{A}_n^{1/2}$$

(19)

In the limit for infinite aspect ratio ($a\to \infty$), the low-frequency approximation of $\beta$ obtained from Equations (16)–(19) is zero.

The authors would like to apologize for any inconvenience caused to the readers by these changes.