Description This project models water flowing over an ogee spillway into a pond using ANSYS Fluent. Two operating regimes are considered: Free-surface flow: water reaches the crest at a set head with a flow rate of 140 kg/s. Pressurized flow: water passes the crest under pressure with a flow rate of 420 kg/s. The geometry is built in DesignModeler as a 2D domain: an ogee overflow discharging into a pond. Two layout variants are used—one with an upstream approach section before the overflow and one without. The inlet boundary is split into water and air inlets. Meshing is done in ANSYS Meshing with a semi-structured grid: 20,142 elements for the free-surface case and 16,409 for the pressurized case. Pond Methodology Both cases use a two-phase VOF model with air as the primary phase and water as the secondary phase to capture the free surface and pressurization behavior through the spillway and into the pond. Conclusion Post-processing yields 2D contours of pressure, velocity, and phase volume fraction for each case. Additionally, static pressure variation along the pond direction is plotted for both configurations to compare free-surface and pressurized flow behavior.

Description This project uses ANSYS Fluent to simulate counterflow in a canal and analyze the resulting fluid behavior. The setup features a main water stream moving along the canal while a second stream is injected in the opposite direction from a floor-mounted pipe. The 3D geometry (DesignModeler) represents a straight channel 8 m long with a 3 m × 1 m rectangular cross-section. A 4 m long pipe of 0.05 m diameter lies along the canal floor. Meshing (ANSYS Meshing) yields 256,899 elements. A transient solver is used. Counterflow Methodology The main channel inflow velocity is 0.3 m/s, while the pipe issues flow at 2 m/s in the opposite direction. The region above the water surface is open to air; a pressure inlet boundary with 0 Pa gauge represents ambient conditions. Because both water and air are present, a VOF multiphase model is employed, with the standard k–ε model for turbulence. Conclusion Post-processing provides 2D and 3D fields of pressure, velocity, and phase volume fraction for water and air. The opposing jet perturbs the free surface and entrains air, producing zones with a locally reduced water volume fraction where the counterflow interacts with the main stream.

Description This project models tank filling (charge) between two same-height reservoirs using ANSYS Fluent. A two-phase VOF approach captures the interaction between water and air, reflecting operations common in chemical processing where phase separation and transfer are key. Geometry & Mesh Geometry: Two 2D reservoirs, each 1.25 × 2.5 m, built in ANSYS DesignModeler. Mesh: Structured grid generated in ANSYS Meshing with 32,510 cells. Simulation Setup Solver: Pressure-based, transient. Gravity: −9.81 m/s² along the Y axis. Physical Models & Properties Multiphase (VOF) Phases: 2 (primary air, secondary water) Interface: Sharp Formulation: Implicit Turbulence Model: Realizable k–ε Near-wall: Standard wall functions Material properties Air: ρ = 1.225 kg/m³, μ = 1.7894×10⁻⁵ kg/(m·s) Water (liquid): ρ = 998.2 kg/m³, μ = 0.001003 kg/(m·s) Boundary Conditions Walls: Stationary wall. Inlet-vent: 0 Pa gauge pressure. Outlet-vent: 0 Pa gauge pressure (pressure profile multiplier = 1). Numerics Pressure–velocity coupling: Coupled. Spatial discretization: Pressure: PRESTO! Momentum: Second-order Volume fraction: Compressive k, ε: First-order upwind Initialization & Run Initialization: Standard. Patch: Water volume fraction = 1 on Surface-body. Time step: 0.001 s Max iterations/step: 20 Number of steps: 10,000 Results The solution yields 2D contours of volume fraction, pressure, velocity, and turbulent kinetic energy. The animation shows air rising as water advances toward the air-filled tank. After several seconds, the system approaches hydrostatic balance, with equal pressure at equal elevations across the connected reservoirs.

Description This project simulates gravity-driven tank discharge in ANSYS Fluent using a two-phase VOF model. The domain comprises three interconnected tanks linked by pipes. Geometry & Mesh 2D geometry (DesignModeler): Tank 1: 229.4 × 157.7 mm rectangle Tank 2: octagon, side length 51.3 mm Tank 3: 229.4 × 100 mm rectangle Mesh (ANSYS Meshing): unstructured, 15,310 elements. CFD Setup Flow: incompressible, transient Gravity: −9.81 m/s² on the Y axis Models & Properties Multiphase (VOF) Homogeneous, implicit formulation with implicit body force 2 Eulerian phases: primary air, secondary water Interface: Sharp with Interfacial Anti-Diffusion Viscous model Laminar Materials Air: ρ = 1.225 kg/m³, μ = 1.7894×10⁻⁵ kg/(m·s) Water (liquid): ρ = 998.2 kg/m³, μ = 0.001003 kg/(m·s) Numerics Pressure–velocity coupling: SIMPLE Discretization: Pressure PRESTO!; Momentum Second-order upwind; Volume fraction Compressive Cell Registers (monitor region) X: 0.08 → 0.379 m Y: 0.2264246 → 0.33 m Initialization & Run Initialization: Standard Patch: set water volume fraction = 1 in Region_0 (Phase2) Time advancement: Adaptive Initial Δt = 1×10⁻⁵ s Δt min = 1×10⁻⁵ s, Δt max = 1×10⁻³ s (Run targets 10,000 time steps) Results Post-processing includes contours of volume fraction, pressure, velocity, and streamlines. Water drains from the primary tank into the second, which cannot hold the entire volume; subsequently, flow proceeds into the third tank via the connecting pipe. Dedicated vents enable air circulation between tanks—visible in the velocity and streamline plots—facilitating continuous discharge and level equalization.

Description This project models the siphon phenomenon in ANSYS Fluent. Fluid moves from higher to lower pressure; in a siphon, water rises to the pipe’s crest due to pressure difference and then descends under gravity. The case is 2D (built in SpaceClaim), meshed in ANSYS Meshing with 95,451 elements, and solved as a transient problem. Siphon Methodology A VOF multiphase model resolves the two-phase (air–water) field driving the flash-tank discharge and subsequent siphoning. Turbulence is handled with the realizable k–ε model and scalable wall functions. Pressure–velocity coupling uses SIMPLE; spatial discretization is second-order upwind for momentum and first-order upwind for k and ε. The domain is initialized by patching the water phase. Conclusion Post-processing provides contours of velocity, pressure, water volume fraction, and streamlines. The flash tank empties as the siphon establishes: water ascends to the pipe’s high point, then, driven by gravity, continues downward. Once initiated, the siphon maintains flow and drains the ponded region.

Description This project performs a two-phase CFD simulation in ANSYS Fluent to study airflow in a Venturi and explicitly track air bubbles as a separate phase within water. As the pipe narrows, continuity increases velocity and, by energy conservation, static pressure drops—the Venturi effect. The 3D geometry is created in SOLIDWORKS and imported into DesignModeler. Meshing is done in ICEM with a structured hexahedral grid (193,932 cells). Because the physics are time-dependent, a transient solver is used. Venturi Methodology A VOF multiphase model resolves the air–water interface and bubble entrainment. At the main inlet, a mixed stream enters with a water volume fraction of 0.7 (70%). As this flow accelerates through the throat, pressure falls, drawing additional air through a hole at the Venturi throat (modeled as a pressure inlet on the top boundary). All inlets and outlets are set to 30 bar total pressure. VOF solves a single set of momentum equations for all phases plus a volume-fraction transport equation for each phase to capture the interface. To sharpen and robustly track the free surface, VOF coupled with a Level-Set method (VOF + Level-Set) is applied, improving interface resolution for immiscible phases with distinct boundaries. The Venturi has two inlets: Main inlet: air–water mixture (70% water by volume). Throat/top inlet: air drawn in by the low pressure at the bottleneck. As air is entrained, the air volume fraction increases downstream of the throat and discrete bubbles appear within the water phase. Conclusion Post-processing yields 2D fields of velocity, pressure, air/water volume fraction, and streamlines across the domain. Results show that acceleration in the throat creates a local vacuum (low pressure), which sucks air into the primary stream; the entrained air mixes with the water, forming a turbulent air–water flow with visible bubbles. Fluent output also provides a time history of the sucked-air flow rate at the air inlet, quantifying entrainment over the transient.

Description This project models a Venturimeter with a U-tube manometer in ANSYS Fluent to show how the manometric fluid column varies. A converging–diverging nozzle creates a pressure difference; one manometer limb taps the throat, the other the converging section. In the low-pressure region, the manometer fluid rises. A multiphase VOF framework is used. Geometry & Mesh 2D geometry: built in DesignModeler. Mesh: unstructured, generated in ANSYS Meshing with 42,413 elements. CFD Simulation Solver: pressure-based, unsteady. Gravity: −9.81 m/s². Models & Properties Multiphase (VOF, homogeneous) 2 Eulerian phases: air and mercury Interface: Sharp Formulation: explicit Body force: implicit body force Turbulence k–ε model Materials Air: ρ = 1.225 kg/m³, μ = 1.7894×10⁻⁵ kg/(m·s) Mercury: ρ = 13,529 kg/m³, μ = 0.001523 kg/(m·s) Boundary Conditions Inlet (air): Velocity inlet, |V| = 1.8 m/s; air volume fraction = 1. Outlet: Pressure outlet, gauge pressure 0 Pa; air backflow volume fraction = 0. Numerics Pressure–velocity coupling: PISO Spatial discretization: Pressure: PRESTO! Momentum: First-order upwind Volume fraction: Geo-Reconstruct k, ε: First-order upwind Initialization & Run Initialization: Standard. Patch: Phase = air, Variable = Volume fraction, Region = region_0, Value = 0. Time step: 0.001 s; 10 max iterations/step; 1,200 time steps. Results A volume-fraction profile is sampled at multiple locations, and 2D contours of density, streamlines, air volume fraction, and mercury volume fraction are produced. Initially, the manometer columns are level; as flow develops, the pressure drop at the throat drives a mercury level difference between the two limbs, visualizing the pressure differential created by the Venturi.

Description This CFD study models sludge settling in a pipe using ANSYS Fluent. Water carrying sludge particles enters the pipe at 0.01 m/s with gravity set to −9.81 m/s² along the y-axis. Geometry & Mesh The geometry (DesignModeler) has two sections: a lower region of quiescent water and an upper region containing the inlet and outlet. Meshing (ANSYS Meshing) uses an unstructured grid with 390,742 cells. Sludge Flow Method Because the flow contains suspended solids, it’s treated as multiphase. Among VOF, Mixture, and Eulerian options, the Eulerian model—commonly used for sludge flows due to its higher fidelity—is selected to represent the interaction between the water phase and sludge particles. Conclusion Post-processing provides 2D contours of velocity and the volume fractions of water and sludge, plus an animation of phase distribution. The mixture enters the pipe uniformly, then sludge progressively settles while the lighter water continues downstream. The pipe’s U-shaped layout promotes accumulation and sedimentation of the sludge phase.