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CFD Fundamentals: Conservation Principles

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Questions and Answers

Which plane is selected for creating the first sketch in the given problem?

XY-plane

What are the diameters of the two circles drawn in the first sketch?

70mm and 66mm

What is the name given to the part extruded from the first sketch?

Outer pipe

What type of mesh is generated initially in the meshing process?

Relatively coarse mesh Signup and view all the answers

Why is care taken to use structured Hexahedral cells in the meshing process?

To reduce numerical diffusion Signup and view all the answers

What is the state type of the inner fluid in the given model?

Fluid (HOT WATER) Signup and view all the answers

What is the continuity equation for 2D incompressible flow?

∂u/∂x + ∂v/∂y = 0 Signup and view all the answers

What is the Navier-Stokes equation for 2D incompressible flow in the X-direction?

∂u/∂t + u (∂u/∂x) + v (∂u/∂y) = - (∂ρ/∂x) + μ[∂²u/∂x² + ∂²u/∂y²] Signup and view all the answers

What is the energy conservation equation for 2D incompressible flow?

∂T/∂t + u (∂T/∂x) + v (∂T/∂y) = κ/ρc [∂²T/∂x² + ∂²T/∂y²] Signup and view all the answers

What are the steps involved in a CFD analysis?

Geometry construction, meshing, describing boundary and initial conditions, and analysis of results Signup and view all the answers

What is the purpose of meshing in CFD?

Decretization of the domain into small volumes where the equations are solved Signup and view all the answers

What type of heat exchanger is built in the ANSYS workbench design module?

Counter-flow heat exchanger Signup and view all the answers

What is the purpose of having a fine mesh in regions of high temperature and pressure gradients?

To capture the gradients accurately Signup and view all the answers

What is the role of Y+ values in turbulence modeling?

To describe how coarse or fine a mesh is for a particular flow pattern Signup and view all the answers

What is the limitation of the standard K-epsilon model in terms of Y+ values at the wall?

Requires a wall Y+ value between 30 and 300 Signup and view all the answers

What is the recommended Y+ value for the standard wall function treatment?

30 Signup and view all the answers

How does the flow velocity near the wall affect the Y+ values?

Faster flow near the wall requires lower Y+ values Signup and view all the answers

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