“We aim to increase the downward force of our vehicle while keeping the drag as low as possible”, says Andreas Fischer, one of the leaders of Strohm + Söhne. Team Strom + Söhne from TH Nürnberg, employed the toolbox in their design of the spoiler, see Figure 4. You can check out the joint movie below for the initial results. The first step is the evaluation of the numerical model for the unsteady flow with conjugate heat transfer using just a few battery cells. This can hardly be achieved with a direct simulation and rather requires a clever choice of simplifying assumptions. The work is still in progress, since the team would like to simulate the entire 30-minute-long run of the car. 3 The battery pack as used by the Form UL SAE Team from Canada Hence, we resorted to the QuickerSim CFD Toolbox with hope of getting better heat transfer and pressure drop data.”įig. “Standard engineering correlations do not account for the transient effects and the flow confinement in the compartment. Pierre Olivier Cimon, one of the team leaders and the developer of this model, recognizes its limitations. One of its modules deals with the issue of unsteady heat transfer in the batteries shown in Figure 3. The SAE team Form UL from Université Laval, Québec, has created a numerical model of their racing car in MATLAB. Temperature fields for two different thermal conductivities Cooling of a Battery Pack A 2D simulation of a laminar heat exchanger. All that is performed by 40 lines of code within a few minutes of calculation on a laptop.įig. On top of that, the heat transfer equations are solved, which is less expensive computationally. First, one resolves the fluid flow, what constitutes most of the computational effort. The toolbox contains a set of functions that lets you generate and improve the boundary layer mesh.Īlthough the geometry here is simple, the basic rule remains the same for more complex cases. Resolving flow and heat phenomena in the vicinity of the solid walls is critical for accurate prediction of heat fluxes and aerodynamic drag. Observe the development of the so-called thermal boundary layer on the pipe walls, whose thickness depends on the fluid properties. Simulating of Heating and Coolingįigure 2 shows results of a 2-Dimensional heat exchanger simulation where the fluid passes past an array of pipes perpendicular to the flow direction as already shown in Figure 1. Still, areas such as battery cooling or simple aerodynamic cases can be analyzed using standard tools by individuals in relatively short time frames. Also, the numerical models used there are very complex and have been validated using extensive experimental trials. Topics such as fuel combustion or noise generation are tackled only by large and experienced engineering departments. While practically any aspect of a car design is subject to CFD analysis, many areas are very demanding. CFD Best Practices for Student Competition Teams Script and illustration of a flow simulation past an array of pipes. Finally, the user can resort to various post-processing tools and manipulate the data flow on his own.įig. Then the iterative process of solving the equations takes place. First, the computational mesh is read in and the solution is initialized. It operates much like a standard CFD solver – a set of routines executes consecutive simulation steps, see Figure 1. The toolbox is based on the Finite Element Method (FEM) and uses the MATLAB Partial Differential Equation Toolbox™ data format. QuickerSim CFD Toolbox, a dedicated CFD Toolbox for MATLAB, offers functions for performing standard flow simulations and associated heat transfer in fluids and solids. We will also share example and give insights into projects that student teams are currently conducting. #2 will be tackled in this post we want to give you an idea of a basic CFD simulation in MATLAB. #1 becomes more and more negligible as even laptops come with multi-core CPUs and even GPUs. quite sophisticated engineering knowledge.Īs you are reading this post, let’s not worry too much about #3.automotive or aircraft aerodynamics, heating or cooling problems and even weather forecasts or climatology.ĭepending on the extent and complexity of its application, CFD requires: It is used to determine flow conditions such as velocity, pressure, or temperature for diverse kind of problems. Wojciech also co-founded the QuickerSim company that specializes in development of fluid flow simulation software.ĬFD modeling has become indispensable in many areas. Wojciech has a PhD in mechanical engineering from Warsaw University of Technology, Poland, and has specialized in Computational Fluid Dynamics (CFD) in his research work. In today’s post, Wojciech Regulski introduces you to modeling fluid dynamics using MATLAB.
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