Incorrect wind tunnel load generation in - direction

[Anonymous]

I am trying to get hang of the wind generation tool. I have modelled a nice tall building which has two towers, first 5 are connected.

In X+ and Y+ directions I get decent values. Whne the map shows there is e.g 800N/m2 pressure (mapped as red) and on the other tower which sits behind it I get smaller results e.g 200N/m2 and the last wall is under suction.

NOW

When I get to the - directions the map shows correctly but when I check the Value Tabel then it goes all bad. 

For example the panel whcih should have 0.8MPa pressure has 0.1 and the last panel of the second tower has the high values instead.  It gives low pressure values and very high suction values

What could be the cause of it or the value tabel is lying to me. I have done overcheck, I did not mix up -X and +X tabels. I converted them into excel and did check of few panels which should be the ones most influenced. 

EDIT: Added a snapshot. Also the Z axis is coming out of the picture, that means it is even in the wrong direction.

[Rafal.Gaweda]

File please

[Anonymous]

https://www.filemail.com/d/ihpdjngiemixfrm

Be gentle as it is my first one.

One odd thing is that the wind loads are generated into inside columns aswell. I wouldnt think that it gets through the imperfections inside the model.

Any other critisicm is welcome aswell. 

[Anonymous]

Out of pure intrest I made a new small example model. about 8 stories high shape of rectangel. Columns shear core and floors. Cladding attached to every floor. (360 degrees).

Again. In +X direction the maps show that the pressure area is in red.. by eye I would say the average should be around 0.8-1.0 kPa, load values gives shady 0.2 kPa. The wall in the suction region again. all in nice light blue shades which indicates quite low pressure but the load tabels give way too high results. 

And when you get to check the -X direction then everything is okay. Meeting my expectations.

Am I missing something or what am I doing wrong with this tool. 

Added this file as the other one is a bit too bulky and big to handle and give answers maybe. 

https://www.upload.ee/files/4557558/Test2.rtd.html

[Rafal.Gaweda]

Hint 1 pressure scale is not refreshed during WS simulation ; user can update it manually pressing Pressure Scale button on WS window, then Normalize , then OK

Hint 2 claddings should be created from floor to floor (or as smaller as possible becasue averaged uniform planar load is applied to them) for Wind Simulation purposes

[Anonymous]

As I understand then you are trying to tell me that the visual aspect is only incorrect but the values are correct. Updating the pressure scale while runnning the simulation does no effect on the end pressure maps.

Even though I normilized pressure scale, the mapping is in red which indicates results around 1. and its not correct.

The last model is posted here  had the Hint 2 done. Claddings did not go over multiple stories.

Also coming back to the first big model. I posted a picture. There is a wall, that is not a cladding and it is size of a .. 3x3m ? and it is still under almost no pressure when the map indicates otherwise.

Any good or bad word is welcome 

[Rafal.Gaweda]

Even though I normilized pressure scale, the mapping is in red which indicates results around 1. and its not correct.

UNfortunately final scale is not the final scale. It is starting scale or "refreshed by user"

Hint 3 update your Robot with Sp3

My results on this file: http://we.tl/X1u3X9pI3o 

[Rafal.Gaweda]

Hint 4 wait for version 2016

[Anonymous]

Let's hope it comes soon and solves some of my problems. 

For me it still is mystery why the suction forces in one way are 3x bigger than the pressure ones on the other side. 

The file you posted, was it made with 2015 SP3?   The towers themselves are not THAT different but wind from - or + side gives quite big difference.

But ah well... Thank you for the help and lets hope 2016 will come before my deadline comes. 

[Anonymous]

One more thing after I installed SP3.

As I have ran through the same building with multiple WS-s with exactly the same settings ive got 2 kind of results. F

First one is calculated for an hour for each direction, it struggles to get the 0.5% mark and the end results is maximum of 1.2kPa.

Second set is calculated fast, maybe 10min max , it gets its 0.5% very quickly and results are barely 0.6-0.8.

According to Eurocode it should be around 0.96.

The file is exactly the same and the ive gotten fast and slow results 2 times each.

What to trust or what is the problem?