Questions tagged [fluid-dynamics]

The study of the properties of fluids and gases in motion

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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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OpenFOAM- write interval changed after restarting simulation

I am running a pimpleFoam simulation on a supercomputer. I have to submit it as a job which has an allocated time. The simulation I was running ran out of this allocated time. So then I restarted it ...
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Lattice Boltzmann method parallelization

I'm learning about the lattice Boltzmann method (LBM) and how it can be parallelized. On Wikipedia, they say, "The LBM was designed from scratch to run efficiently on massively parallel ...
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What happens at the interface between a solid and a fluid?

I am doing an MPM simulation of water colliding against a solid, I am currently encoding the model for collision forces and I am realising something isn't clicking. Let us assume the fluid experiences ...
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Error - Getting negative temperature while solving Quasi 1D flow in a Nozzle (JD Anderson Book)

I am currently trying to solve Nozzle Flow problem from JD Anderson Book. Here's my entire python code - ...
1 vote
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How can we use the two boundary conditions for the Taylor-Maccoll Equations for Cone Shock Waves?

The Taylor-Maccoll equations below govern the gas dynamics around a supersonic, axially oriented cone. Using the notation from Anderson's Fundamentals of Aerodynamics, which uses a dimensionless ...
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Why do we use modified pressure in incompressible multiphase solvers with gravity?

The context of my question is two-phase incompressible solvers such as interFoam in OpenFOAM, but I have seen this trick used ...
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Fluent Induced Drag Aerofoil Convergence Error

I am currently modelling what happens, to lift induced drag, when you apply washout to a wing (Twist). However I have a few issues the drag values I calculate are into the 1000s the drag values ...
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Energy potential involvign pressure and viscoscity?

Making a really long explanation short. I am looking for an energy density function for an incompressible isotropic fluid that involves both viscoscity and pressure. The reason is, there is a way to ...
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How to specify the value of pressure in a point in solving steady stokes equation numerically?

I try to solve the steady-Stokes equation numerically on , that is \begin{aligned} -\nabla \cdot \mathbb{T}(\mathbf{u}, p) & =\mathbf{f} \quad \text { on } \Omega=[0,1]*[-0.25,0], \\ \nabla \cdot \...
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