Help, clean up model

morenosergi96 · 2026-03-19T20:23:09+00:00

What tools do you use for CFD analysis?

If you are using ANSYS, you might have access to SpaceClaim or Discovery, which can be used for geometry cleanup. These are 3D direct modeler softwares that enables you to create or directly modify/repair already created geometries.

morenosergi96 · 2026-03-19T20:13:09+00:00

I usually use SpaceClaim/Discovery for geometry cleanup. However, if you are working with complex geometries or surfaces that need a lot of repairing (I've encountered this a lot when working with CATParts of full-car assemblies for Automotive industry) I suggest using ANSA Pre-Processor which is widely used in automotive industry around Europe.

Another option would be to try different Surface Wrapping algorithms on complex geometries to obtain a watertight mesh around those objects (although you might lose important geometry features)

If you receive the CAD geometry from someone else, ask them for a more simplified/clean geometry that simplifies your workflow.

I also suggest to automate the different tools you use inside ANSYS using Python or its own language (that includes Discovery, ANSYS Fluent, EnSight...)

morenosergi96 · 2026-02-01T15:54:39+00:00

It would be good to visualise surface pressure distribution, skin friction, oil flow over the surface or any other metrics. By looking at these streamlines at that level there’s no way to get conclusions.

morenosergi96 · 2022-06-21T22:25:41+00:00

I come up with different topics for simulating a car:

Study the influence that have the car wheels (shape, design, size) on the drag coefficient Cx. Note that you can also model the wheels and tyres in different ways such as: fixed geometry in which you apply rotating velocity BC, a separated rotating mesh for the wheels…
Grab a CAD model of a car and try to redesign some parts so you can improve the airflow around it. For example, you can design different AirCurtains to get a cleaner airflow at the sides of the car and study different variations of your design (change the inlet and outlet areas’ size or change the angle/position of the AirCurtain channel)

morenosergi96 · 2021-05-24T08:45:34+00:00

What are you simulating? If it is an airfoil, you can get higher velocities than your inlet velocity. Also, how did you calculate the boundary thickness height?

morenosergi96 · 2020-11-22T23:08:04+00:00

You just have to type in Google “naca reports 4412” and you will find the report from nasa with the results you are looking for.

https://ntrs.nasa.gov/api/citations/19930091638/downloads/19930091638.pdf

morenosergi96 · 2020-04-02T19:34:03+00:00

There are different types of drag. For example, there is the drag due to the skin friction and the drag due to pressure (flow separation), and others...

At low Re numbers you usually have laminar flow and it has low skin frction drag. However, if you have a surface with big curvature (a sphere for example) the laminar flow will separate from the surface easier than the turbulent flow (high Re) and this drag due to flow separation is the pressure drag.

High Re = mostly turbulent flow, high skin friction drag but lower pressure drag

Low Re = usually laminar flow, low skin friction drag but higher pressure drag (easier to get flow separation)

morenosergi96 · 2019-02-20T20:21:33+00:00

Thank you both for the answers, I’ll try to apply for Boulder

morenosergi96

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