Altair Engineering Inc., a provider of simulation technology and engineering services, has acquired ACUSIM Software Inc. ACUSIM is a developer of massively scalable, high-fidelity CFD solver solutions. ACUSIM's CFD technology and staff will be incorporated into Altair's HyperWorks CAE software portfolio and operations. Unlike other commercial CFD applications, ACUSIM's AcuSolve general purpose CFD solver is finite-element based, allowing it to be tightly integrated with other FEA-based technologies to solve complex fluid-structure interaction and multiphysics problems. ACUSIM technologies will be made available through Altair's HyperWorks simulation platform and patented units-based licensing system. As a result, customers will be able to immediately access all software titles offered by Altair, further increasing the value of their investment in HyperWorks and ACUSIM. ACUSIM will continue to operate from its Mountain View, CA, facility, while working closely with the HyperWorks development organization at Altair's headquarters in Troy, MI, on integration roadmaps.