I had my simulation (incompressible) set up in a usual way like projects I did half a year ago. However, I could not get a reasonable result. The airflow from a 3m/s source could get over 100m/s result somewhere in the testing zone. Obviously, the wrong result pattern is confusing.
Here is the test I did and I have had ran several times with different set up I can think about.
This is a screen shot of run 5.
In run 5 I had my input velocity speed at 3m/s but received over 40m/s around my testing object. And the flow vectors around the inlet do not point in the right direction.
I suspect my simulation run time is too short (500s), thus I extend it, and ran 6 shows the same problem and the flow pattern is incorrect according to my limited experience.
Could anybody help discover where I had incorrect setting up? Thanks million~
Hi there, thank you for using the forum!
The issue here is mesh related (23k cells are way too little here). Could you try Level 5 and a region refinement around the building? You can use this project as reference:
The purpose of this simulation is the examining of the behavior of air flow through a modern urban landscape. CFD wind engineering, constitutes a valuable source of input for urban developers, architectural designers and environmental planners to promote natural ventilation, a good measure for reducing energy use in buildings and providing better outdoor air quality.
You can have a look at the finished project here.
Part 1. Prepare the CAD Model and Select the Analysis Type
The Geometry use…
You can also activate the potential flow initialization, and set the end time to 1000 sec in the Simulation Control too.
Let me know how this goes