PMID- 33261406 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201202 IS - 1520-8524 (Electronic) IS - 0001-4966 (Linking) VI - 148 IP - 5 DP - 2020 Nov TI - Time-domain room acoustic simulations with extended-reacting porous absorbers using the discontinuous Galerkin method. PG - 2851 LID - 10.1121/10.0002448 [doi] AB - This paper presents an equivalent fluid model (EFM) formulation in a three-dimensional time-domain discontinuous Galerkin finite element method framework for room acoustic simulations. Using the EFM allows for the modeling of the extended-reaction (ER) behavior of porous sound absorbers. The EFM is formulated in the numerical framework by using the method of auxiliary differential equations to account for the frequency dependent dissipation of the porous material. The formulation is validated analytically and an excellent agreement with the theory is found. Experimental validation for a single reflection case is also conducted, and it is shown that using the EFM improves the simulation accuracy when modeling a porous material backed by an air cavity as compared to using the local-reaction (LR) approximation. Last, a comparative study of different rooms with different porous absorbers is presented, using different boundary modeling techniques, namely, a LR approximation, a field-incidence (FI) approximation, or modeling the full ER behavior with the EFM. It is shown that using a LR or FI approximation leads to large and perceptually noticeable errors in simulated room acoustic parameters. The average T(20) reverberation time error is 4.3 times the just-noticeable-difference (JND) threshold when using LR and 2.9 JND when using FI. FAU - Pind, Finnur AU - Pind F AD - Henning Larsen, Copenhagen, Denmark. FAU - Jeong, Cheol-Ho AU - Jeong CH AD - Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark. FAU - Engsig-Karup, Allan P AU - Engsig-Karup AP AD - Scientific Computing, Department of Applied Mathematics and Computer Science, Technical University of Denmark, Kongens Lyngby, Denmark. FAU - Hesthaven, Jan S AU - Hesthaven JS AD - Computational Mathematics and Simulation Science, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland. FAU - Stromann-Andersen, Jakob AU - Stromann-Andersen J AD - Henning Larsen, Copenhagen, Denmark. LA - eng PT - Journal Article PL - United States TA - J Acoust Soc Am JT - The Journal of the Acoustical Society of America JID - 7503051 SB - IM EDAT- 2020/12/03 06:00 MHDA- 2020/12/03 06:01 CRDT- 2020/12/02 05:20 PHST- 2020/12/02 05:20 [entrez] PHST- 2020/12/03 06:00 [pubmed] PHST- 2020/12/03 06:01 [medline] AID - 10.1121/10.0002448 [doi] PST - ppublish SO - J Acoust Soc Am. 2020 Nov;148(5):2851. doi: 10.1121/10.0002448.