I have made a CAD Model of a Telecom Antenna and imported it into SimScale. I created an external flow region with a velocity inlet of 150 km/h and an atmospheric pressure outlet. I was able to run an incompressible simulation on it.
Here is where I ran into issue with parsing the data.
For context, this is the antenna we are trying to sample in CFD simulation. This information is available on the manufacturer website.
https://www.andrew.com/globalassets/digizuite/263003-p360-nhh-65b-r2b-comprehensiveexternal.pdf
https://www.andrew.com/globalassets/digizuite/1019603-nhh-65b-r2b-line-drawing-638797320030587253-new.PDF
Here are both the specifications and line drawing of the Telecom Antenna we are trying to sample.
In the specifications, there are listed EPA and Wind loadings in the Mechanical Specifications section we are trying to match.
However looking at the Force Plot, I get a front force that is about 200N above the listed force in the specification
We are also trying to match the EPA that is shown in the specification, but I have not found a way to parse that information out of the results.
Would like to find some way of find both the EPA and a matching frontal force on this antenna.
Hi,
Some quick comments, after having a look at the project:
- 100 mph is not equal to 150 km/h.
- It’s best to keep pressure outlet at 0 Pa because this is an incompressible study (we use gauge pressures here)
- From what I gathered, EPA is some kind of projection of the surface area of the part? If so, you would normally use a CAD software for this, and not SimScale (e.g. * similar to this)
sorry, shared the wrong project.
This one has it at 150 km/h.
I will keep in mind about the pressure out being at 0 Pa instead of at atmospheric pressure.
For EPA, it might be a little more complicated than just the surface area. A straight projection of the area of the part would be way too conservative as it does not take into account the roundness of the part. The roundness of the part reduces the drag coefficient when finding the EPA through calculation estimates. Similar to how a super car can have a drag coefficient of less than 0.3. What I am attempting here is to find an actual EPA through simulation rather than calculation estimates.
Sorry if that did not make sense.
I tried the pressure outlet to be at 0 Pa, and it barely lowered the force on the model.
I have also tried it with the part walls being slip. which that should not be a real world scenario.
It lowered the force on the part, but still not enough to match the manufacturer specification.