Team_Bart wrote: ↑18 Sep 2018, 22:18
Hi, I had some question and little feedback on MantiumFlow.
This is great, I like feedback of all kinds very much. Somehow customers do not give any feedback even when I ask, no idea why.
Team_Bart wrote: ↑18 Sep 2018, 22:18
First, I used the new version a few times and I noticed that in the new added line (so, only in this line), which you can copy to virtual stopwatch, the cop not always show the correct values and the cooling flow is always 6.
So you are a bit new to this to know. The corrected CoP thing is old carry over from the days this championship was called "KVRC". Your CoP gets corrected up to 5cm to your advantage. I hope this is what you see. If I made a mistake here, please send the case.
The cooling flow here only gets set to 6 if it is not automatically detected which of the monitored values is the cooling flow. When this happens there should be an additional message. I will check later if it does not find its way into the HTML report. It is for sure in the text output in the command window.
Team_Bart wrote: ↑18 Sep 2018, 22:18
Also I had some questions. First, can I find somewhere how Cl and Cd and Cp are calculated? Like which length scales are used for example.
I guess as you are a student you can do some research yourself. In the case folder, use a text editor to check the file system/forceCoeffs. You will learn a bit about OpenFOAM and that it can be a bit confusing.
Team_Bart wrote: ↑18 Sep 2018, 22:18
Secondly, what am I exactly seeing in the new added graphs? Seems like a kind of vortexes?
Yes, by showing isosurfaces of certain Lambda2 values, it is possible to visualize vortex structures. Here these vortices are also colored with the velocity which gives some additional information. This Lambda2 stuff is not very intuitive in my opinion. You can check how it is calculated here:
https://en.wikipedia.org/wiki/Lambda2_method
Team_Bart wrote: ↑18 Sep 2018, 22:18
And what is exactly the differeces between Cp total and Cp slice?
As you are a student, you should figure this out on your own and learn. This should be of some help:
https://en.wikipedia.org/wiki/Bernoulli%27s_principle
Team_Bart wrote: ↑18 Sep 2018, 22:18
Third, the last simulations i use, next to the MantiumFlow postprocessor, the graphs I can make with Paraview, which are really cool! With paraview it is possible to slice your car anywhere you like. Is it also possible to do this with the analyses you got from MantiumFlow postprocessor (but than by yourself ofcourse)? Like the Cp slices or streamlines on any distance you like?
The idea of MantiumFlow is to automate the whole process. Before building the simulation you can go into the settings and change the number of slices. Additional streamlines are generated on all monitoring surfaces. So you can add more than just the one in your radiator. The idea behind all this is to make CFD accessible to non-CFD engineers. But as you will have noticed, you can just open the case with Paraview and do whatever you want with it.
Team_Bart wrote: ↑18 Sep 2018, 22:18
I guess MantiumFlow is building a case and this is solved by BlueCFD. Is that correct? So, to have a better understanding about what is going on, just start learning to work with BlueCFD? Or is MantiumFlow doing more?
MantiumFlow is a pre and post-processer, in this case for OpenFOAM. This means it helps create the case for OpenFOAM and later post-processes it, which includes generating that html report you get in the end.
OpenFOAM is the actual CFD software we are using. CFD solvers usually run on Linux (most software is super expensive and tied to the number of CPU cores you want to use, so performance is very important).
For Windows, the way to run OpenFOAM is the version by BlueCFD. This makes running OF on Windows very easy and convenient.
), so here is a teaser of a small tech article I will publish tomorrow (hopefully) about my car. I think I will open a dedicated page, as we used to do in the good old days.
