The Digital Waveguide Mesh (DWM) method for room acoustic simulation has been introduced in the last years to solve sound propagation problems numerically. However, the huge computer power needed in the modeling of large rooms and the complexity to incorporate realistic boundary conditions has delayed their general use, being restricted to the validation of theoretical concepts using simple and small rooms. This paper presents a complete DWM implementation that includes a serious treatment of boundary conditions, and it is able to cope with different materials in very large rooms up to reasonable frequencies. A simulation of a real large building modeled with a high degree of precision has been carried out and the obtained results are presented and analyzed in detail.
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