Numerical Simulation of the Flow Field in a Tubular Thermal ... - MDPI
based on the simulation results.
Hydraulic structures—dams, spillways, intake towers, and conduits—are the backbone of water management, power generation, and flood control. While designed for extreme durability, these structures are subject to continuous environmental stresses, including hydraulic pressure, abrasive sediment, and thermal fluctuations. flow 3d hydro crack hot
FLOW-3D HYDRO was applied to the on the Missouri River—a 1,444 ft structure with 28 gates—demonstrating the 2D/3D hybrid approach’s effectiveness.
: High-velocity or high-pressure fluid streams penetrate micro-fissures, acting as hydraulic wedges that accelerate macroscopic crack propagation. Key Simulation Capabilities of FLOW-3D Numerical Simulation of the Flow Field in a Tubular Thermal
When "hot" fluids come into contact with cold concrete or steel surfaces, a steep thermal gradient develops. The outer layers of the material try to expand or contract faster than the underlying bulk structure, generating high tensile stress points.
As fluid flows into an open crack, it exerts an internal hydrostatic pressure against the crack walls. This phenomenon acts like a wedge, increasing the stress intensity factor ( KIcap K sub cap I ) at the tip of the crack. Mathematically, the effective stress tensor σijeffsigma sub i j end-sub raised to the eff power While designed for extreme durability, these structures are
creates an immediate localized . The rapid decline in temperature induces sudden volumetric contraction within the mineral matrix. Because the surrounding rock constrains this contraction, a massive localized spike in thermal tensile stress occurs. Pore Pressure and Effective Stress Shift
At the higher discharge rate of 4400 m³/s, the simulations revealed a high likelihood of cavitation at critical locations, including the ogee curve and the angle transition in the chute channel. These areas were identified as requiring specific mitigation measures — such as aeration devices or surface treatments — to prevent cavitation‑induced damage.
Simulating the lifecycle of a thermal crack within hydraulic structures requires a solver capable of bridging the gap between fluid dynamics and solid mechanics. The core modules of FLOW-3D provide the technical tools necessary to capture these phenomena simultaneously.
: It includes models for air entrainment , cavitation , and phase change (evaporation/condensation), which are critical when high-temperature fluids interact with water.