SAN RAFAEL -- Autodesk Inc. (NASDAQ:ADSK) today announced that it signed a definitive agreement to acquire Blue Ridge Numerics Inc., a provider of simulation software, for about $39 million in cash.

On Tuesday, Autodesk said it plans to acquire software user-interface tools maker Scaleform Corporation for roughly $36 million in cash.

Charlottesville, Va.-based Blue Ridge Numerics’ CFdesign technology will be added to the Autodesk simulation software portfolio for manufacturers, which currently includes Autodesk Inventor, Autodesk Algor Simulation and Autodesk Moldflow. It will broaden the Autodesk solution for digital prototyping to provide customers with a spectrum of computational fluid dynamics (CFD) capabilities that help automate fluid flow and thermal simulation decision-making for designs, while eliminating costly physical prototyping cycles, according to the company.

"Simulation represents a significant growth area for Autodesk, and we are focused on strengthening our portfolio in this area both organically and through acquisitions," said Robert Kross, senior vice president of the Manufacturing Industry Group. "The acquisition of Blue Ridge Numerics will add important new simulation capabilities to virtually test and predict how a product or building design will work, allowing our customers to compete more effectively at every step of the design process."

Autodesk introduced AutoCAD software in 1982.  The company now makes 3D design, engineering and entertainment software for the manufacturing, architecture, building, construction, and media and entertainment industries.

The company employs about 1,200 at its San Rafael headquarters.

At the end of the Thursday trading session, Autodesk's stock price was $43.66 a share, which was 18 cents, or 0.41 percent, below the Wednesday per-share price.