2016
DOI: 10.1080/14733315.2016.1173292
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Simulation of HVAC flow noise sources with an exit vent as an example

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Cited by 4 publications
(4 citation statements)
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“…Figure 18 shows the acoustic source terms obtained from the CFD solution on the cut plane y = 0 utilizing different turbulence models in wetted conditions. As shown by Saarinen and Siikonen [56], the divergence of the divergence of the Lighthill tensor, or the source term of the acoustic wave equation, can in incompressible cases be simplified to ∇ We can see that in the wetted case, the acoustic source term distribution was more concentrated and regular near the hub vortex than in the cavitating case. In the cavitating case, the source distribution was spread to a slightly wider radius in the wake.…”
Section: Wake Flow Structuresmentioning
confidence: 68%
“…Figure 18 shows the acoustic source terms obtained from the CFD solution on the cut plane y = 0 utilizing different turbulence models in wetted conditions. As shown by Saarinen and Siikonen [56], the divergence of the divergence of the Lighthill tensor, or the source term of the acoustic wave equation, can in incompressible cases be simplified to ∇ We can see that in the wetted case, the acoustic source term distribution was more concentrated and regular near the hub vortex than in the cavitating case. In the cavitating case, the source distribution was spread to a slightly wider radius in the wake.…”
Section: Wake Flow Structuresmentioning
confidence: 68%
“…In case of nonhomogeneous EE solutions, the velocities of each phase U φ are solved individually; in case of two phases, such as liquid l and gas g, the Lighthill tensor reads T = α l ρ l U l U l + α g ρ g U g U g . Moreover, following Saarinen and Siikonen [68], for incompressible flows, the forcing term of Equation (15), namely ∇ • ∇ • T, can be directly related to the Q-criterion, which is the second invariant of the velocity gradient tensor ∇U, by the relation ∇…”
Section: Hydroacousticsmentioning
confidence: 99%
“…Figure 18 shows the acoustic source terms obtained from the CFD solution on the cut plane y = 0 utilizing different turbulence models in wetted conditions. As shown by Saarinen and Siikonen [56], the divergence of the divergence of the Lighthill tensor, or the source term of the acoustic wave equation, can in incompressible cases be simplified to ∇•(∇• Tij )=S inc = −2ρQ (kg/m 3 s 2 ), where Q is the second invariant of the velocity gradient tensor. Figure 19 furthermore shows the acoustic source terms, obtained from the CFD solution, on the plane x/D = 0.5 for the wetted and cavitating cases.…”
Section: Acoustic Excitationsmentioning
confidence: 99%