FLOTHERM国外培训资料_v71.ppt

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FLOTHERM国外培训资料_v71

Lecture 1A Introduction to FLOTHERM Flomerics philosophy To put CFD and EM analysis software in the hands of Design Engineers FLOTHERM – Design of Electronic Systems FLO/PCB – Conceptual Board Design FLO/EMC – Design for Electromagnetic Compatibility FLOVENT – Design of Built Environment What is CFD? “Computational Fluid Dynamics or CFD is the analysis of systems involving fluid flow, heat transfer and associated phenomena, such as chemical reactions by means of computer-based simulation” FLOTHERM – What does it do? Solves airflow and heat transfer problems in electronics equipment Airflow is the movement of air caused by natural (buoyancy) or mechanical (fans) forces Heat transfer is the transfer of thermal energy because of a temperature difference Three modes exist… FLOTHERM – What does it do? Conduction through a solid or a stationary fluid FLOTHERM – What does it do? Convection from a surface to a moving fluid FLOTHERM – What does it do? Radiation heat exchange between two surfaces Types of FLOTHERM models How does FLOTHERM work? Airflow and heat transfer are governed by the following equations: Conservation of Mass (continuity) Conservation of Momentum Conservation of Energy These equations are known as the Navier-Stokes Equations How does FLOTHERM work? The Navier-Stokes Equations can be expressed in common form: How does FLOTHERM work? Need to use the Finite Volume Approach: How does FLOTHERM work? Point P and its surrounding points are represented in FLOTHERM by grid cells How does FLOTHERM work? FLOTHERM uses a Cartesian grid with the option for localized regions A value for Pressure and Temperature is calculated at each cell center Component of velocity is calculated at every cell face How does FLOTHERM work? At any stage in solution residual errors (R) can be calculated for each grid cell: For continuity: (mass flow out – mass flow in – mass source) kg/s For temperature: (heat flow out – heat flow in – heat source) W For velocities: (momentum f

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