Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans

Young J. Moon, Yong Cho, Hyun Sik Nam

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


Time-accurate viscous flow solutions are sought for the prediction of unsteady flow characteristics and associated aeroacoustic blade tonal noise of a cross flow fan. The two-dimensional incompressible Navier-Stokes equations in a moving coordinate are time-accurately solved by an unstructured finite-volume method on triangular meshes, and a sliding mesh technique is utilized at the interface between the domain rotating with blades and the stationary one for allowing the unsteady interactions. An accuracy assessment of the present method is made by comparing the fan performances with experimental data for a rotational speed at 1000 rpm and the Reynolds number 5300 based on blade tip speed and chord length. With the computed unsteady viscous flow solutions, sound pressure is predicted using Curle's equation and narrow-band noise characteristics of three impellers with a uniform and two random pitch (type-A and -B) blades are compared by their sound pressure level spectra. Also, the frequency modulations of the blade passing frequency noise by random pitch fans are discussed.

Original languageEnglish
Pages (from-to)995-1015
Number of pages21
JournalComputers and Fluids
Issue number7
Publication statusPublished - 2003 Aug


  • Aeroacoustic noise
  • Cross flow fan
  • Unsteady viscous flow

ASJC Scopus subject areas

  • Computer Science(all)
  • Engineering(all)


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