Applications where radiative heat transfer is critical include: design of light bulbs and lamps, heating elements and furnace equipment, and spacecraft and satellites.įor the special case of problems that are dominated by conductive heat transfer and/or radiation, Flow Simulation has an option for “Heat conduction in solids only” which completely disables the fluid flow calculations-effectively removing the “flow” in Flow Simulation. Radiation becomes crucial between components with very high temperatures, or those operating in near-vacuum conditions. As the thermal performance of such systems is often dominated by conduction and convection, radiative heat transfer is often assumed to be minor and neglected in the simulation to reduce solution time. Heat removal in the high-powered electronics manufactured today is typically accomplished by air or liquid cooling. The ability to simulate heat transfer in fluids is maintained, so heat generating solids will automatically convect heat away to the surrounding fluid.Įnabling the radiation option in the Project Wizard allows definition of emissivity and performs simulation of radiative heat transfer. Enabling the option for heat conduction in solids will open up a variety of new options in the project, namely: the ability to define materialswith thermal conductivity properties, heat sourceswith their own temperatures or heat generation rates and goals that track the temperature and thermal properties of various solids.įigure 1. The Project Wizard allows selection of various physical effects at the time of project creation. Mechanisms of Heat Transferīy default when creating a new project, Flow Simulation simulates heat transfer in fluids and performs a steady-state analysis.
#SOLIDWORKS FLOW SIMULATION FAN TUTORIAL FULL#
External analyses represent a larger computational domain, such as a room full of air around the product to be analyzed. Internal analyses represent closed wall systems such as electronics enclosures, or a piping system or manifold.
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Transient analysis makes it possible to input curves for conditions such as heat sources to represent duty cycle, or analyze problems which may be constantly fluctuating and have no steady-state solution at all.Īnalysis can be internal or external.
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Transient analysis is enabled via the time-dependent checkbox in the Project Wizard, which iterates over physical time steps and stores results over the time history of the solution, at the cost of extended solution time. By default, new projects are treated as steady-state. Steady-state and transient calculations can be performed. The appropriate definition of goals is thereby crucial to ensuring accuracy and reasonable computation time. In other words, the solver continues to iterate until the values of the goals flatten off, indicating that the system has reached steady-state equilibrium. In the case of steady-state analysis, the convergence of goals is tracked and utilized as a stopping criteria for the solver.
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Key parameters of interest are tracked during the solution by the creation of user-defined goals. The computational domain is broken up into a Cartesian mesh, a grid-like mesh made up of box-shaped cells, which will be discussed later in this article. Background & Terminologyįlow Simulation is a computational fluid dynamics (CFD) analysis package using the finite volume method. This article will examine the use cases of SOLIDWORKS Flow Simulation as it relates to thermal analysis, with a specific focus on predicting the performance of electronics cooling systems. The ability to simulate heat conduction combined with convective heat transfer generated by airflow over heatsinks and chip packages offers a high degree of confidence in temperatures predicted, especially when compared to traditional hand calculations or FEA-based thermal analysis where assumptions about airflow must be input in the form of convection coefficients. One of the most common applications of Flow Simulation today though is thermal analysis for predicting cooling performance of electronics and other heat generating components. Because it is a general-purpose fluid dynamics analysis package, Flow Simulation can analyze a wide variety of problems, including: aerodynamic and hydrodynamic problems such as pump and propeller design, head loss in piping systems and coefficient of drag calculations for vehicles. SOLIDWORKS Flow Simulation is a powerful, general-purpose CFD package integrated directly into the SOLIDWORKS CAD environment.