Questions tagged [fluid-dynamics]
The study of the properties of fluids and gases in motion
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Good references for the P3/P1dc element
I am struggling to find some good references for the P3/P1dc element (cubic element for velocity and linear piecewise discontinuous for pressure) for the Stokes/Navier-Stokes equations.
Is there a ...
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Boundary Conditions on the Inlet and Outlet in a Discontinuous Galerkin framework
In the book Discontinuous Galerkin Method (DGM), Analysis and Applications to Compressible Flow by Vít Dolejší and Miloslav Feistauer, Springer, it is mentionned, in section 8.3.2 that deals with ...
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Getting singular matrices for lid driven cavity problem
I was trying to solve the lid driven cavity problem using the galerkin method with SUPG stabilization. I was using GMRES method as my solver and I am also getting a solution. And the solution looks ...
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Immersed Boundary FEM reference recommendation
I want to do some Fluid-Structure Interaction using the Immersed Boundary FEM.
Could you please recommend some books or lecture notes on it?
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2D cavity flow: Adding zero Dirichlet condition to the top boundary leads to NAN
I am following this guide to create a simple cfd solver for incompressible 2D fluid in a square cavity. The following Matlab code sample from the guide creates a Laplacian (coefficient) matrix with ...
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Lowest order Raviart Thomas elements
I have questions regarding the implementation of Lowest order Raviart Thomas elements on quadrilaterals, some papers use the basis functions in this form:
for example the right edge: $N = \left[\dfrac{...
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Any resource focusing on choosing the right SPH simulation parameters?
I am a software engineer with no prior experience in numerical and/or physical models (apart from very simple particle simulations). The last few weeks I've been trying to implement a 2D real-time SPH ...
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Applicability of 1/7 power law for turbulent flow
I am looking to do a CFD study of a turbulent flow through a pipe. I know the average velocity from the flow rate so I decided to use the popular 1/7th power law model for the fully developed ...
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Need help with adaptive meshing code
I am trying to understand adaptive meshing and is using this code (https://github.com/esquivas/amr1d) as a reference. However, there is no documentation for it and thus, it is hard for me to ...
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Bachelor thesis going out of hand, need help [closed]
I am currently working on my bachelor thesis, which aims to enhance the multigrid preconditioned conjugate gradient algorithm proposed by Tatebe in 1993 using Deep Learning.
Currently, I am ...
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How to calculate the force of solid applied by fluid? Using finite difference method, DNS, staggered grid, SIMPLE algorithm, immersive boundary
Problem
I am using finite difference method to solve classic problem of flow around cylinder, for validation of my group's immersive boundary method.
The common way to validate numerical method is ...
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How do we implement the balance of stress on interface in ALE FSI method?
""we aim for a consistent variational-monolithic coupling scheme in which we need all equations defined in the same domain; therefore, $\mathrm{ALE}_{f x}$ was introduced. In variational ...
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Exact Riemann Solver for Multi-Component 1D Euler Model
I am concerned looking for an exact Riemann solver for compressible 1D multi-component Euler equations, supplied with the ideal gases equation of state and under the assumptions:
Mechanical ...
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How to implement the interface extension of fluid "displacement" in ALE?
In ALE, we first set a referenced space for fluid, then we extend the boundary fluid displacement to the whole fluid region, take harmonic extension as an example, we need $$\Delta \left ( \hat{u} \...
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Any code on ALE method for N-S equations or advection-diffusion equations?
I'm currently reading the book computational fluid-structure interaction, but the book doesn't provide any code, and I can't understand the ALE method, could you please provide some codes written in ...
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