{"id":34573,"date":"2022-02-11T09:38:16","date_gmt":"2022-02-11T14:38:16","guid":{"rendered":"https:\/\/blogs.sw.siemens.com\/simcenter\/?p=34573"},"modified":"2026-03-26T06:23:57","modified_gmt":"2026-03-26T10:23:57","slug":"noise-cancelation-is-gone-too-far","status":"publish","type":"post","link":"https:\/\/blogs.sw.siemens.com\/simcenter\/noise-cancelation-is-gone-too-far\/","title":{"rendered":"Noise cancelation gone too far!"},"content":{"rendered":"\n

Did you know that only about 25% of consumers consider how noisy a product is as a buying decision? But \u201cmany of them come to regret this, and half of such disgruntled shoppers say they would pay as much as 50% extra for a product that makes half as much noise\u201d<\/a>? <\/p>\n\n\n\n

Did you also know that side mirrors are one of the major noise sources of a car? Especially in electric vehicles?<\/p>\n\n\n\n

Well, easy I hear you say, why not get rid of those.<\/p>\n\n\n\n

New world, new rules, new competitive landscape<\/h2>\n\n\n\n

Electrification boosts vehicle fleet at becoming quieter<\/h3>\n\n\n\n

Getting rid of the side-view mirrors is an aggressive but effective solution to the problem of decreasing its induced aeroacoustics sound, especially more prominent in our vehicle fleet becoming quieter through electrification\u2026<\/p>\n\n\n\n

Admittedly, I can see us already there\u2026 It just takes a side glance at the latest innovations in vehicle design to see a tad of the future on our streets. Some of those designs have something in common\u2026 they have no side-view mirrors altogether. Have you ever considered how futuristic such vehicles look just without? In some countries, vehicle legislation is being reviewed to authorize the use of cameras instead of conventional side mirrors.<\/p>\n\n\n\n

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Tesla Cybertruck concept without side-mirrors (source: cnet.com article<\/a>)<\/figcaption><\/figure><\/div>\n\n\n\n

Ensure passenger comfort through side mirrors aeroacoustics CFD improvement<\/h3>\n\n\n\n

While we all start dreaming now, the reality is this: if you like it or not, despite these first legislative considerations, if you are a car owner or engineer (or both) you will need to cope with side mirrors and related aeroacoustics for some time to come!<\/p>\n\n\n\n

And so, it pays to consider aeroacoustics effects in product design for years to come and millions of cars to be sold \u2013 and computational aeroacoustics simulations are critical to avoid costly prototypes during the product\u2019s design phase.<\/p>\n\n\n\n

Simcenter STAR-CCM+ 2022.1 affirms itself as a partner for design teams in this journey through the release of a new hybrid aeroacoustics offering:<\/p>\n\n\n\n

the Perturbed Convective Wave model.<\/strong><\/p>\n\n\n\n

<\/div>\n\n\n\n

Run faster side mirrors aeroacoustics CFD predictions<\/h2>\n\n\n\n

Extended hybrid aeroacoustics capabilities<\/h3>\n\n\n\n

The Perturbed Convective Wave model is inherently faster by design. Hybrid methods solve an additional equation for the sound source based on a source term from the flow. They are much less computationally intense for incompressible simulations than Direct Noise Calculations which solve for the full compressible, unsteady flow field, where the sound field is part of the flow solution.<\/p>\n\n\n\n

In addition to being faster simply by being a hybrid approach, this model brings significant performance improvements, compared to the existing Acoustic Wave model for simulations.
In this model, the sound source is relatively close to the receivers, such as for side-view mirrors where the shear layer and turbulent fluctuations caused by the side mirrors are relatively very close to the side-glass and consequently driver and passenger\u2019s ears.<\/p>\n\n\n\n

Side mirrors aeroacoustics CFD test on AeroSUV model<\/h3>\n\n\n\n

The performance improvements of those applications are very noticeable due to the longer computational times required for these simulations. We went on to put to the test the AeroSUV model<\/a>, developed by FKFS (Forschungsinstitut f\u00fcr Kraftfahrwesen und Fahrzeugmotoren Stuttgart)<\/a>.<\/p>\n\n\n\n

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AeroSUV model in FKFS scale model wind tunnel<\/figcaption><\/figure><\/div>\n\n\n\n

The AeroSUV simulation was virtually instrumented with:<\/p>\n\n\n\n