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  • Assessment of Neural Network Augmented Reynolds Averaged Navier Stokes Turbulence Model in Extrapolation Modes

    Abstract: A machine-learned model enhances the accuracy of turbulence transport equations of RANS solver and applied for periodic hill test case. The accuracy is investigated in extrapolation modes. A parametric study is also performed to understand the effect of network hyperparameters on training and model accuracy and to quantify the uncertainty in model accuracy due to the non-deterministic nature of the neural network training. For any network, less than optimal mini-batch size results in overfitting, and larger than optimal reduces accuracy. Data clustering is an efficient approach to prevent the machine-learned model from over-training on more prevalent flow regimes, and results in a model with similar accuracy. Turbulence production is correlated with shear strain in the free-shear region, with shear strain and wall-distance and local velocity-based Reynolds number in the boundary layer regime, and with streamwise velocity gradient in the accelerating flow regime. The flow direction is key in identifying flow separation and reattachment regime. Machine-learned models perform poorly in extrapolation mode. A priori tests reveal model predictability improves as the hill dataset is partially added during training in a partial extrapolation model. These also provide better turbulent kinetic energy and shear stress predictions than RANS in a posteriori tests. Before a machine-learned model is applied for a posteriori tests, a priori tests should be performed.

  • USACE’s Hurricane Helene recovery operations at Thurmond Lake pivot

    SAVANNAH, Ga. – The J. Strom Thurmond Lake Project, managed by the U.S. Army Corps of Engineers, Savannah District, continues its mission to salvage timber in the aftermath of Hurricane Helene, and pivots its operations from wilderness areas to recreation areas.

  • Corps of Engineers releases Final EIS for Willamette Valley dams

    The U.S. Army Corps of Engineers (USACE), Portland District has released the Willamette Valley System Operations and Maintenance Final Environmental Impact Statement (FEIS).

  • MKARNS Nav Notice No. SWL 25-28 Lock 1 Nav Pass Open (Over Weir)

    The tailwater elevation at Norrell Lock (No. 1) NM 10.3 has exceeded 155.0 feet. The buoy line has been removed and all vessels shall pass over the weir between the channel marker lights, as directed by lock personnel.

  • Corps of Engineers opens Minneapolis locks for navigation season

    The U.S. Army Corps of Engineers, St. Paul District, is opening its Lower St. Anthony Falls Lock and Dam and Lock and Dam 1, both in Minneapolis, to commercial and recreational vessels for the navigation season on Sunday, April 20.

  • Lower Granite changes public crossing hours

    CLARKSTON, Wash. – Starting April 17, Lower Granite Dam and Lock will be implementing changes to the public crossing schedule.

  • Sensor Fusion for Aerial Robotic Systems

    Abstract: As uncrewed aerial vehicle (drone) use expands across industries so also does the complexity of sensor payloads. At present, there are no commercially available products for the management and fusion of multisensor data. Sensor Fusion for Aerial Robotic Systems (SFARS) is a sensor agnostic, modular platform for intelligent multisensor data fusion and processing. At the time of writing, SFARS exists as a root codebase, a PC application for processing of previously collected drone data and as a prototype hardware platform for real-time drone deployment. This report serves as a technical users guide to the design, development, and implementation of the suite of SFARS software.

  • Temporary recreation area closures, service reductions begin May 1 across USACE Omaha District

    The U.S. Army Corps of Engineers, Omaha District, will temporarily close or reduce services at multiple recreation areas across Nebraska, South Dakota, North Dakota and Montana beginning May 1, 2025.

  • Efficiency Drives New Offboarding Process at the Middle East District

    A conversation between two colleagues at the Middle East District led to the creation of an innovative online offboarding system. Mary Beth Murray and Marcie Piper developed the tool in mid-2024 using SharePoint and Power Automate to replace outdated, inefficient processes. Their collaboration improved accountability, reduced risk, and streamlined employee departures. The system’s success highlights how creative problem-solving and teamwork can drive impactful change across an organization.

  • PPS and USFK Acquisition Partners host Joint Industry Day in South Korea

    In partnership with Public Procurement Service (PPS), United States Forces Korea (USFK) Acquisition Partners including the U.S. Army Corps of Engineers – Far East District, Nonappropriated Fund (NAF) Contracting – Korea, Defense Logistics Agency (DLA) Indo-Pacific and 411th Contracting Support Brigade (CSB) hosted Joint Industry Day April 9, 2025, at the Seoul Regional Public Procurement Service building in Seoul, South Korea. Over 200 potential contractors attended the event.