Bureau of Reclamation Banner

Technical Service Center
Sedimentation and River Hydraulics Group


U2RANS is a three-dimensional (3D) Unsteady and Unstructured Reynolds Averaged Navier-Stokes solver. The code was developed by Dr. Yong Lai while he was appointed as the senior research staff and adjunct associate professor at the Iowa Institute of Hydraulic Research, University of Iowa. The model is highly accurate, well verified and validated, and has been successfully applied to many research and engineering projects.

Briefly, U2RANS is a comprehensive general-purpose model. Three-dimensional hydraulic flow models such as U2RANS are accurate and mature tools, which have been routinely used to address many hydraulic engineering problems such as:

The main limitation is that they are usually applied to a river reach less than five miles in length due to their heavy requirement for computer power.

U2RANS uses current state-of-the-art, unstructured CFD technology, unifies multi-block structured mesh (quad or hex) and unstructured mesh (quad, triangle, tet, hex, wedge, pyramid, or hybrid) elements into a single platform, and combines 2D and 3D solvers in a common framework. A User’s Manual is available, which provides a more detailed description about the general features and capabilities.

Processes modeled include:

Processes Ignored

Model Input

Model Output

Potential Use of Output Results

Contact Young Lai for interest in using our 3D modeling capabilities.