Multi story building: envelope flow path coordinates for PLD file creation

[Yasir Mohieldeen]

Hi;

I am creating WPP profiles library for a 2 floors building.  For the flow paths in the 2nd floor shall I enter their coordinates relative to the 2nd level or ground level, especially the Z coordinate?

Thak you  

[William Dols]

It is unclear to me what process you are using to create WPP library files.

If you are referring to the Relative Elevation entered into ContamW for each flow path, this is always relative to the floor on which the path is located.

You can then have ContamW generate the PLD file (via the Weather -> Create WPC File .. dialog box), and it will adjust these values based on the level elevation to determine the value for the Z coordinate relative to the base of the building.

If you are creating WPP files manually, then this coordinate is irrelevant, because the WPP is directly associated with flow paths via the Wind Pressure tab of the Airflow Path Properties dialog box.

- Stuart

 

[Yasir Mohieldeen]

Hi;

I am using CONTAMw/Weather/Create WPC file, as in the Contam-3-Tutorial Exterior CFD coupling. I have 3 issues:

1- The Wall Azimuth Angel of the REFBLOCK is 198 degrees, is this the Coordinate Transformation Rotation Angle? (see attachment)

2- If the relative elevation of a path on the 1st floor is 1.5m, and the height of the ground level is 4m, does the height will be adjusted to 5.5m automatically when calculating PLD or do I need to adjust it manually?

3- My REFBLOCK covers a small part of the building, does it need to cover the whole building?

Thank you

[Dols, William Stuart (Fed)]

1. Referring to the documentation accessible by pressing F1 on the keyboard in ContamW (help below revealed when pressing F1 while viewing the Create WPC File dialog box).

CFD0/WPCTranlator does not utilize the EWC file, but creates the WPP library from the CFD0 outputs as presented in the tutorial.

 

2. As I said in the previous message, the relative height will be adjusted accordingly. This is easily verified by generating the PLD and reviewing it in a text editor.

 

3. Referring to the documentation of the tutorial:

REFBLOCK means that one corner of that building will be used as the reference location for exporting data.

You must specify one and only one building with the name "REFBLOCK".

 

- Stuart

 

From: con...@list.nist.gov con...@list.nist.gov On Behalf Of Yasir Mohieldeen
Sent: Friday, May 10, 2024 2:42 AM
To: CONTAM <con...@list.nist.gov>
Cc: Dols, William Stuart (Fed) <willia...@nist.gov>; yasir...@gmail.com <yasir...@gmail.com>
Subject: [contam] Re: Multi story building: envelope flow path coordinates for PLD file creation

 

Hi;

I am using CONTAMw/Weather/Create WPC file, as in the Contam-3-Tutorial Exterior CFD coupling. I have 3 issues:

1- The Wall Azimuth Angel of the REFBLOCK is 198 degrees, is this the Coordinate Transformation Rotation Angle? (see attachment)

2- If the relative elevation of a path on the 1st floor is 1.5m, and the height of the ground level is 4m, does the height will be adjusted to 5.5m automatically when calculating PLD or do I need to adjust it manually?

3- My REFBLOCK covers a small part of the building, does it need to cover the whole building?

Thank you

On Thursday, May 9, 2024 at 4:42:42 PM UTC+3 William Dols wrote:

It is unclear to me what process you are using to create WPP library files.

If you are referring to the Relative Elevation entered into ContamW for each flow path, this is always relative to the floor on which the path is located.

You can then have ContamW generate the PLD file (via the Weather -> Create WPC File .. dialog box), and it will adjust these values based on the level elevation to determine the value for the Z coordinate relative to the base of the building.

If you are creating WPP files manually, then this coordinate is irrelevant, because the WPP is directly associated with flow paths via the Wind Pressure tab of the Airflow Path Properties dialog box.

- Stuart

 

 

On Thursday, May 9, 2024 at 8:09:26 AM UTC-4 yasir...@gmail.com wrote:

Hi;

I am creating WPP profiles library for a 2 floors building.  For the flow paths in the 2nd floor shall I enter their coordinates relative to the 2nd level or ground level, especially the Z coordinate?

Thak you  

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[Dols, William Stuart (Fed)]

Thanks, Leon!

I should mention that a WPCTranslator executable (developed by Dr. Leon Wang) that works with CFD0Editor outputs as described in the tutorial is available on the Software page of the NIST Multizone Modeling website.

 

- Stuart

 

From: Liangzhu (Leon) Wang <lzw...@gmail.com>
Sent: Friday, May 10, 2024 1:22 PM
To: Dols, William Stuart (Fed) <willia...@nist.gov>
Cc: CONTAM <con...@list.nist.gov>
Subject: Re: [contam] Re: Multi story building: envelope flow path coordinates for PLD file creation

 

Hi All,

 

You can download the WPC Translator source code here.

https://github.com/CUBELeonwang/WPCTranslator

 

I think it can be used if you want to develop your own translator instead of using CFD0.

Thanks!

Leon

 

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[Yasir Mohieldeen]

Dear Stuart;

Thank you very much for clarifying this to me.  

Regards

[Yasir Mohieldeen]

Dear Stuart;

The LB2 library files that I generated crashes CONTAM every time I try to add it as a library file in Data/Wind Pressure Profiles.  I think there is a mistake as the corner of the case-study Villa is in the middle of the REFBLOCK (the building has 2 villas and I am using one villa as a case study)- Please see attachment.  The rotation angle is 18 deg I presume.  I appreciate your help.

Regards

On Friday, May 10, 2024 at 6:15:06 PM UTC+3 Dols, William Stuart (Fed) wrote:

[Yasir Mohieldeen]

Dear All;

I have run the WPCTranslator.exe and it generated a profile for only one flow path that is on REFBLOCK,  and assigned 0 coefficient value for the rest. The message I got is "Path 2 is not on a building surface, exit" for the rest of the paths. It seems that REFBLOCK needs to cover all flow paths in order to generate profiles.  If this is the case, then I find it not easy to generate such REFBLOCK for my case study villa.

Regards

[Yasir Mohieldeen]

Dear All;

I decided to run the CFD0 exterior model multiple times, every time with different REFBLOCK that covers some flow paths. Later I can combine the LB2 libraries in one with all profiles of flow paths in the Villa. It takes long time for one run though.

Do you think this is a rationale solution or there is another way around this problem (having irregular rectangle building)

Regards

On Friday, May 10, 2024 at 10:35:30 PM UTC+3 Yasir Mohieldeen wrote:

[Dols, William Stuart (Fed)]

You should also ensure that your blockages and grid align.

I think it’s best to define the grid regions to align with the blockages and then subdivide them.

The red lines shown on the image below indicate the distinct regions of the grid.