ES - Relatórios técnicos
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Browsing ES - Relatórios técnicos by Subject "Computational Fluid Dynamics"
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- NewSOL Project : Fluent: Case 0Publication . Azevedo, PedroABSTRACT: This document presents all the described steps in order to set up what is called Case 0. In the following work the inlet mass flow and temperature, the heat losses through walls, the materials themselves and their properties, including, porosity and the turbulence and radiative heat transfer models can also be changed. Everything can change, but the mesh. The only exception to this is to refine the mesh a little bit in particular areas in order to increase detail and mitigate some flow problems and improving the results.
- NewSOL Project : Thermal propertiesPublication . Azevedo, PedroABSTRACT: In order to implement the simulation of as thermal process in a computational fluid dynamics application, it is needed to know the thermal properties of the involved chemical species., namely the density, the specific heat, the dynamic viscosity and the thermal conductivity. The experimental determination of the thermal properties for the molten salts and for the S. Domingos Mines ore were performed by, respectively, Yara and UEvora. In Section 2, the determined thermal properties for both materials are presented; In Section 3, the thermal properties for the molten salts are assessed and adapted to the CFD application package; In Section 4, the same work is performed for the ore slurry; and in Section 5 some conclusions are disclosed.
- NewSOL Project: Available CFD models assessmentPublication . Lima, Maria Margarida de Lemos Canedo Giestas; Azevedo, PedroABSTRACT: The partial differential equations that govern fluid flow and heat transfer are not usually amenable to analytical solutions, except for very simple cases. Therefore, in order to analyze fluid flows, flow domains are split into smaller subdomains (made up of geometric primitives like hexahedron and tetrahedron in 3D and quadrilaterals and triangles in 2D). The governing equations are then discretized and solved inside each of these subdomains. In the present situation, a finite volume method will be used to solve the approximate representation of the equations’ system. Care must be taken to ensure proper continuity of solution across the common interfaces between two subdomains, so that the approximate solutions inside various portions can be put together to give a complete picture of fluid flow in the entire domain. The subdomains are often called elements or cells and the collection of all elements or cells is called a mesh or grid. The origin of the term mesh (or grid) goes back to early days of CFD when most analyses were 2D in nature. For 2D analyses, a domain split into elements resembles a wire mesh, hence the name.