ANSYS Fluent- Steady and Transient Flow Around a Cylinder of Different Reynolds Number

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Adam Rozman

Күн бұрын

Пікірлер: 17

@punished_snake4122 10 ай бұрын

bro thanks you're really spiderman

@christosvasiliou219 Жыл бұрын

Another question, for high re numbers you just not put laminar flow you pick the k-epsilon something, also, what is the actual difference of transient vs steady, which is the one to go if geometry is complex and rey number is high. Reynolds number for your example is changing in terms of the speed, the other factors are being the same

@adamrozman Жыл бұрын

Here we are modeling unsteady flow using RANS, so turbulence is simulated using a model (K-epsilon in this case). Unsteady flow is a fluid quality, while transient or unsteady is just how ANSYS is treating your solution. If I run this as steady instead of transient, it will eventually reach an average solution. I'm running transient here because I want to see the shedding propagate in real time. However, steady/transient depends on your application. If you just need to find average lift and drag, you can run steady, even if there is turbulent flow, until your values average out.

@tahanadeem5249 Ай бұрын

thanks peter parker

@fikirinijr6807 4 жыл бұрын

your presentation is good, next lesson Try to explain clear the figures

@christosvasiliou219 Жыл бұрын

i have a project for my thesis, it is a very complex geometry (submarine that looks like a drone). Its reynolds number is 67000 so for sure i need to run a transient calculation. My question is, how do you set up the inflation layers,numbers,division e.t.c every part you did or you have to do to run a cfd calculation in terms of the complexity-high reynold number.

@adamrozman Жыл бұрын

You can do a triangles surface mesh for the 3d body. You can qualify this by a constant triangles size. Play around a bit depending on the size of your object. Generally you'll want to follow airfoil rules where you clump the points more towards the leading and trailing edge. The inflation layers are to capture boundary layers. For this case the number of layers is excessive- for your case use about 20 layers and look up a y+ spacing calculator online to figure out wall spacing given your design parameters. The wall spacing to give y+ (non dimensional parameter) equal to 1 is the size of your first inflation later.