The use of flow control in modern aero-design is currently an area of great interest. Vortex generators (VGs) are efficient passive flow control devices attracting interest due to their reliability and cost-effectiveness. In order to find the best possible vortex generator configuration for a specific application, computational fluid dynamics (CFD) tools are often used. However resolving such small scale devices require fine grids and time consuming computations as a consequence. A reliable VG model could shorten computational time significantly by reducing grid size and complexity. A new tuning-free body-force model has been developed and tested for a low-profile vortex generator installation in a turbine transition duct. For the case studied it has been concluded that reasonably accurate results could be obtained with a grid size reduction of up to approximately 80 by using the VG model.