Indoor airflow simulation result

grasshopper butterfly
1

Hello I am new to the butterfly simulation and I was trying the simulation for indoor airflow.
I successfully tested the example file so I modify the file to my case, but the result comes out strange though.
Any suggestions?

Indoor%20airflow
Indoor airflow.png1509×807 160 KB
Indoor_airflow_1401.gh (432.8 KB)

2

By the way, the mesh that created is really strange but I think the boundary setting is ok though…?

3

Hi,@endison8
The rhino geometry is missed in your grasshooper definition . Please upload it for further discussion.

image
image.png1248×642 98.1 KB

4

Hi, sorry for the late reply, here is the file:

5

Hi,@endison8
There are serval bug for your grasshooper definition.

  1. refine will should be more higher to retain the shape of geomertry.
    image
    image.png1379×459 63.4 KB
  2. The X/Y/Z mesh count should be more.
    image
    image.png1592×552 73.1 KB

    3.the surface level should equal to max refine level.
    image
    image.png1234×561 41.6 KB

    Here is the screenshot of velocity in Rhino.
    image
    image.png1313×721 36.5 KB

    And I suggest you to use paraview for visualization.
    image
    image.png1916×1030 229 KB
6

Thank you so much for the reply, sorry but I have a few questions though…

  1. may I ask what does the refine level mean? Why should I set to (4,4) instead of the example file (2,2)?
  2. Number 3: the surface level should equal to max refine level. I’m not sure which of the screen shot setting made the surface level equal to the max refine level?
7

Hi,@endison8

The value of refine level depends on the details of the geometry.East and west windows are thin and long. You should set a grid for east and west windows,so you should set high level for them.

The refine levle I set is (4,6).So the surface level is 6.

8

Hi @minggangyin
How did you determine the cell count? I’ve tried to input 3 numbers like you did but it produced very large numbers for velocity with the majority of the cells stayed at blue (lowest number)

image
image2405×700 209 KB

9

After I disconnected the cell_count the result seems to be correct, however I want to get finer result than that

image
image2336×697 295 KB

10

hello, could anyone help me? I tried to run the simulation but the result is not what I needed to be.

image
image1920×1080 512 KB

I can’t find the error on the model.

20032021 Scripted Pasar Rumput Lantai Hunian Butterfly.gh (634.2 KB)

thank you in advance.

11

@minggangyin could you please help me with this? Thank you.

12

@tsuwys You model is complex. So the meshing maybe failed. Please check the mesh and make sure all the meshing is inside of room.

14

@minggangyin ah I see, let me check. May I ask about something else? when we’re define the refine levels, is there any provision before changing the numbers?

15

@tsuwys You should study the blockMesh and snappyHexMesh setting in OpenFOAM.
Here is a nice tutorial for this.
http://www.wolfdynamics.com/wiki/meshing_OF_SHM.pdf

image
image1260×849 280 KB

image
image1197×904 64.9 KB

16

@minggangyin thank you so much for your help.

17

are this simulation with buttrfly