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1 Ι © Dassault Systèmes Ι Confidential Information Ι SolidWorks Flow Simulation Instructor Guide
2 Ι © Dassault Systèmes Ι Confidential Information Ι What is SolidWorks Flow Simulation? SolidWorks Flow Simulation is a fluid flow and heat transfer analysis software fully integrated in SolidWorks. SolidWorks Flow Simulation simulates the testing of your model's prototype in its working fluid environment. It helps you to answer the question: What are the fluid flow effects on the prototype and the prototype's effects on the fluid flow? SolidWorks Flow Simulation is used by students, designers, analysts, engineers, and other professionals to produce highly efficient designs and/or optimize their performance.
3 Ι © Dassault Systèmes Ι Confidential Information Ι Design Cycle with SolidWorks Flow Simulation Use SolidWorks to build the model. Use SolidWorks Flow Simulation to simulate the object’s fluid environment and thermal effects. Based on results, modify the model and simulate until you are satisfied with the design. Manufacture the model. SolidWorks SolidWorks Flow Simulation Analyze Satisfied? Hardware No Yes
4 Ι © Dassault Systèmes Ι Confidential Information Ι Benefits of Analysis Design cycles are expensive and time-consuming. Analysis reduces the number of design cycles. Analysis reduces cost by testing your model using the computer instead of expensive field tests. SolidWorks Flow Simulation analysis shortens the object's way to the market. Analysis can help you optimize your designs by quickly simulating many concepts and scenarios before making a final decision.
5 Ι © Dassault Systèmes Ι Confidential Information Ι The Finite Volume Method Analytical solutions are only available for simple problems. They make many assumptions and fail to solve most practical problems. SolidWorks Flow Simulation solves time-dependent Navier- Stokes equations with the Finite Volume Method (FVM) on a rectangular (parallelepiped) computational mesh. FVM is a general approach for both simple and complex problems. This method is among preferred methods for fluid phenomena modeling.
6 Ι © Dassault Systèmes Ι Confidential Information Ι Computational Domain Computational domain is a rectangular prism where the calculation is performed. Computational domain’s boundary planes are orthogonal to the Cartesian coordinate system’s axes. In case of an internal problem, the computational domain envelopes the fluid volume inside a model. If heat transfer in walls is considered, the model walls are also included. In case of an external analysis, the computational domain covers the model's surrounding space.
7 Ι © Dassault Systèmes Ι Confidential Information Ι Types of Boundary Conditions Velocity, mass flow rate, volume flow rate, or pressure (static and total) boundary conditions are specified at models' inlets and outlets. Ambient fluid conditions are specified at far-field boundaries in case of external analysis. Fans at models' inlets and outlets, as well as inside the computational domain can be specified. Symmetry boundary conditions, as well as ideal wall can be specified if necessary.
8 Ι © Dassault Systèmes Ι Confidential Information Ι Types of Boundary Conditions The following heat boundary conditions can be specified at the model walls in contact with fluid: Adiabatic wall Wall with specified Temperature Wall with specified Heat flux or Heat transfer rate Wall with specified Heat transfer coefficient Real wall with roughness Ideal wall (adiabatic frictionless wall) Moving wall (to simulate translation/rotation of a wall)
9 Ι © Dassault Systèmes Ι Confidential Information Ι Main Steps of Analysis Define type of analysis, physical features, fluids and solid materials. Specify boundary conditions. Define goals of your analysis. Mesh the model. This is a series of automatic steps in which the code subdivides the model and computational domain into computational cells. Run the analysis. Check convergence if needed. Visualize the results.
10 Ι © Dassault Systèmes Ι Confidential Information Ι Physical Features taken into Account Both steady-state and time-dependent problems can be solved. Time-dependent equations are solved by employing local time steps. Flows of incompressible and compressible viscous heat- conducting multi-species liquids and non-Newtonian liquids can be calculated. Sub-, trans-, and supersonic compressible flows of viscous heat- conducting multi-species gases can be calculated. Regions with different types of fluid in one model.
11 Ι © Dassault Systèmes Ι Confidential Information Ι Physical Features taken into Account Heat conduction in solids and heat radiation between to and from solids can be calculated simultaneously. Heat sources can be specified at surfaces and in volumes. Gravitational effects can be taken into account. Porous media can be specified as a distributed drag. Surface-to-surface heat radiation and radiation to ambient. Global and local rotating reference frames.
12 Ι © Dassault Systèmes Ι Confidential Information Ι Physical Features taken into Account Water vapor condensation. Calculation of relative humidity. Heat sink simulation. Thermoelectric (Peltier) coolers. Cavitation in a water flow.
13 Ι © Dassault Systèmes Ι Confidential Information Ι Analysis Background Time-dependent Reynolds-averaged 3D Navier-Stokes equations using the k-e turbulence model. Boundary layer modeling technology for valid laminar, turbulent or transitional boundary layers. Modeling of friction, heat transfer and flow separation. Heat conductivity equation in solid, surface-to-surface radiation heat transfer, conjugate solution of heat transfer phenomena in solid, fluid and ambient space.
14 Ι © Dassault Systèmes Ι Confidential Information Ι Advanced Numerical Technologies Automatic meshing tools allows to create mesh for any arbitrary 3D model. Implicit solver with multigrid. Automatic tools for convergence analysis and stopping the calculation. Advanced technologies for result processing and 3D visualization. Automatic resolution of model and flow field peculiarities.
15 Ι © Dassault Systèmes Ι Confidential Information Ι Goals of Analysis Calculation of flow field parameters (pressure, temperature, density, velocity, concentrations, etc.) at any point, surface or volume of computational domain. Calculation of temperature at every point in the model. Calculation of transient phenomena throughout the flow field. Calculation of forces and moments, aerodynamic coefficients. Calculation of shear stress distribution produced by the flow field.
16 Ι © Dassault Systèmes Ι Confidential Information Ι Goals of Analysis Calculation of mass and volume flow rates through your devices. Determination of pressure drops, hydraulic resistance. Calculation of heat flows, heat transfer coefficients. Calculation of particles trajectories in the flow field and parameters of particle interaction with the model.
17 Ι © Dassault Systèmes Ι Confidential Information Ι Meshing Meshing subdivides the model and the fluid volume into many small pieces called cells. Smaller cells give more accurate results but require more computer resources. You must remesh the model after any change of geometry. Material and boundary condition parameters changes do not require remeshing. Automatic meshing system will create mesh in accordance with the specified minimum gap size, minimum wall thickness, result resolution level.
18 Ι © Dassault Systèmes Ι Confidential Information Ι Running Analysis During analysis, the program iterates towards a solution. SolidWorks Flow Simulation provides advanced easy-to-use tools to analyze convergence, calculation results, or evolution of transient analysis results in time as well as tools to preview the results without stopping the analysis. SolidWorks Flow Simulation has a state-of-the-art, fast, accurate and stable solver. SolidWorks Flow Simulation has an automatic system for stopping the analysis when it meets predefined convergence criteria.
19 Ι © Dassault Systèmes Ι Confidential Information Ι Visualizing Results SolidWorks Flow Simulation provides advanced easy-to use tools to visualize the results: Cut, 3D-Profile and Surface Plots (contours, isolines, vectors), Isosurfaces, XY plots, Flow and Particle Trajectories, Animation of Results. SolidWorks Flow Simulation provides advanced tools to process the results: Point, Surface and Volume Parameters, Plots of Goals, MS Word Report.
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