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Questions tagged [fluid-dynamics]

In physics, fluid dynamics is a subdiscipline of fluid mechanics that deals with fluid flow—the natural science of fluids (liquids and gases) in motion.

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xunit how N to N double almost equal

My code is public void Compare_CoolProp_with_CoreMediumDensity() { Water coreWater = new Water(Pressure.FromPascals(101325), Temperature.FromKelvins(300)); GetCoolPropOriginal asd = new GetCoolPropOriginal(); GetCoolProp…
ORHAN TOPDAĞ
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Strange Fluid Simulation oscillations in Unity

I am trying to implement a fluid surface simulation using the paper Fast Hydraulic Erosion Simulation and Visualization on GPU as a template to simulate water. However, I get artifacts like this: The code for my update function is below, I have…
Brandon Fung
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Find Normal and Tangential components of motion in box2d/matter.js

I'm trying to recreate a fluid-drag model as seen in paragraph 2.2.1 of this paper. A working version can be seen in this this youtube movie (where I found the paper). In the paper they state that they calculate the normal and tangential forces of…
Swen Mulderij
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Make a multi-part "fluid body" act as one single body

I am using Phaser.js and its p2 physics in order to simulate what "fluid bodies". You can see in this example that a kind of fluid body is created (credits to John Watson). The only possible interaction is with mouse movement. I have noticed some…
DigitalEvolution
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Flow field around cylinder in Matlab

I'm pretty new to different plots in Matlab and I'm trying to write a code that will show the flow field around a cylinder in Matlab. I'm at the very start and first of all I want to just make the circle in a rectangular domain (cylinder should not…
user3460758
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Linear solver implementation

I came across the following implementation of a linear solver, which is used to implement Jos Stam's stable fluids method: /** * Iterative linear system solver using the Gauss-sidel * relaxation technique. Room for much improvement here... …
Brandon
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Normal Blur for Screen Space Fluid Rendering

I'm trying to achieve screen space fluid rendering, but I've run into a few issues with blurring. From what I understand, I'm supposed to be blurring the normal map using Bilateral Filter so that the lighting does not act as if it was bouncing off…
Matt
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Modelica: Program a static solver to converge to a solution during the simulation. CFD example

Generic question: I work on Modelica with OpenModelica. I would like to program my own solver in Modelica to converge to a solution because I think OpenModelica can't solve my problem. Is it possible? Specific case: I developed a model of a…
Roland
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Spritekit Simulating fluid currents

Is there an easy way to simulate currents within a scene? I know they offer gravity, mass, density, drag and other attributes within spritekit, but what I am not seeing, is how would I simulate a current affecting objects on the scene? IE say I…
Speckpgh
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How to create Fluid motion in android

i need to render Fluid inside a bottle and when the device is rotated
Sourav
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How GAMG Preconditioner in OpenFOAM really works?

I use OpenFOAM for CFD simulations. A very popular preconditioner is GAMG which needs a low number of iterations per a time step in SIMPLE or PISO solvers that are used to simulate the fluid flow. I would like to understand how GAMG prepares the…
luksmir
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Beginners guide to own CFD code? 2D Euler Equation

Do you know a good and especially easy guide to code one's own Computational Fluid Dynamics solver, for the 2D Euler equations? I just would like to understand what commercial software like Fluent is doing. And when it's easy enough I would like to…
Andreas Hornig
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Getting unexpected values for Characteristic Lyapunov Exponents in Python - What could be going wrong with my implementation of Benettin algorithm?

I wrote a code to calculate the Characteristic Lyapunov Exponents in Python for a Lorenz system. I for sure did something wrong because the CLEs are way off but I cannot figure out what. I am using the Benettin et al. algorithm. I start by randomly…
M409
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Fluid simulation tutorial in javascript, values never initialized?

I am looking at this snippet in a fluid simulation tutorial. I have searched for where those values are initialised and it seems they are never written to? There is a line that initialises the array this.s. this.s = new…
Makogan
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Solving system of nonlinear equations numerically in python

I want to solve the following problem numerically and first defined it as a function: def F(x, na=1, nb=2, L=6, A=0.09, V=0.54, dh=0.03, k=10**-2, dB=0.005, fB=38, ur=0.39, rhoW=998, rhoG=1.2, g=9.81, pu=10**5, myW = 10**-3): #variables …
Nikolas
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