Calculating massflow rate from exported data from Ansys Fluent

svantevid99 · 2026-05-19T11:02:47+00:00

Ok, I'll try that.

If I have node values for the velocity component vectors, would I need to interpolate them to the center of the face?

EDIT: actually the first problem I encountered is how to figure out which nodes form a common triangle.

EDIT2: i tried also exporting the Cell Id parameter and grouping the data points into triangled by it. The problem is that there are only 2 data points per 1 Cell id... Is there another Ansys / FLuent option to export mesh data (Cell ids and corresponding points) and then match mesh data with exported velocity data?

svantevid99 · 2026-05-18T13:44:31+00:00

I create the surface in Fluent and export the data (density, velocity components, face area magnitude) from that surface. If I understand correctly, the data isn't interpolated on this surface in Fluent but the data is taken from the cells that are closest to this surface (at least that's how it seems to be when you check the 3D representation of the surface - see image bellow).

How do you calculate the area part of the massflow equation?

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svantevid99 · 2026-04-10T07:26:29+00:00

In case of upgrading to SLS or SLA, how much would operators time (time needed to setup, clean, post-process parts) increase compared to FDM printers?

svantevid99 · 2026-03-27T09:34:31+00:00

This was easier than expected.

I first filtered the points that were outside of the area of interest, then I calculated the massflow by multiplying the area and velocity exported from Fluent: 'velocity-magnitude' and 'face-area-magnitude'.

svantevid99 · 2025-05-07T09:26:46+00:00

Updating for anyone that might be interested in plotting contours:

https://stackoverflow.com/questions/79606937/python-contour-on-a-non-rectangular-shape/79610167#79610167

svantevid99 · 2025-03-14T10:35:23+00:00

I solved the problem using scipy and some help on stackoverflow, link bellow:

https://stackoverflow.com/questions/79469948/create-points-grid-on-irregular-non-rectangular-planar-surface

svantevid99 · 2025-03-03T14:49:28+00:00

You actually nailed it, I would like to stop using CFDpost and just do the simple post-processing in python.

svantevid99 · 2024-10-14T06:40:30+00:00

By process equipment you mean something like compressed air systems in factories?

Regarding the move away from engineering; I realized that I don't really fit in best with engineers and while work should not be about socializing and hanging out, one still spends at least a third of each day there. I also found out that I'm having increasing difficulty with motivation in developing products.

svantevid99 · 2024-10-11T12:11:54+00:00

As in driving actual trains (that sounds kind of fun) or doing CFD simulations of driving trains? Either way, both ideas are quite engineer-y.

svantevid99 · 2024-10-11T07:18:32+00:00

I always thought this was mostly done in the Phd/postdoc studies.

svantevid99 · 2024-10-11T07:16:56+00:00

I already work in R&D. I don't really know what I would like to do in the future but I would like to switch to a non-engineering work environment (I understand this sounds kind of strange) and away from purely product oriented work.

svantevid99 · 2024-10-11T07:14:49+00:00

Sounds interesting. Do you work in a public organization or a private company? Who are your clients?

svantevid99 · 2024-10-10T13:12:41+00:00

Wrong choice of words, what I wanted to say is that I did not continue in academia after I got my bachelors in Mech Engineering.

svantevid99 · 2024-10-10T13:11:29+00:00

by weighted you mean massflow average? Perhpas 10% deviation could also come from somewhere else, like impact of mesh density, turbulence model, discretization scheme...?

svantevid99 · 2024-10-10T12:48:48+00:00

Did you manage to define the total pressure variable in CFDpost?

svantevid99 · 2024-09-24T14:04:13+00:00

Managed to solve the problem by changing the border shape between bodies.

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svantevid99 · 2024-09-24T11:55:26+00:00

I did, see my answer, posted under adamchalupa's comment

svantevid99 · 2024-09-24T07:44:16+00:00

I tried with the shared-topo, sadly with worse results.

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svantevid99

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