pressure

Altair Forum User

hello, everyone!

Can anyone tell me How to apply pressure on a certain area (it is a plane) through the pressure data points in EXCEL?

or can it be achieved in OptiStruct 14.0 ?

because the pressure can not be expressed by a specific function, so I want to apply pressure data points in EXCEL.

can some give some suggestions or tutorial files?

mvass

Hello.

 

try the following: Go to Analysis-->Pressures--> Select the elements where the load will be applied-->instead of 'magnitude' select 'linear interpolation'. There you can load a .csv or .txt file which will contain the following information per line (make sure there is a clear space or tab between the values):

 

Node ID  |   x coordinate  |   y coordinate  |   z coordinate  |   pressure value 

 

Note: I have checked this with hypermesh 10.0. I do not know if the same process applies to 14.0 (I think it does).

Altair Forum User

Thank you ! I will try it

mvass

Hello, thank you. The process that I have described is correct, however the format of the .txt file is for nodal forces, not pressures (last column will be Fx, Fy, Fz values). I have done this in the past for pressures and I checked the input files. They contain fewer columns of data with the last being the pressure magnitude. I think your .txt file should be (per line):

 

node x coordinate   |   node y coordinate   |  node  z coordinate   |   pressure magnitude

Altair Forum User

Thank you ! The element type in the model you have done in the past is solid element or shell element ?

Can you share some tutorials for instruction ? the element type in my model is solid element.

and Linear interpolation only works with shell elements from online help.

 

<?xml version="1.0" encoding="UTF-8"?>

 

Altair Forum User

Hi,

You can create a dummy layer of Skin elements over the solid elements to apply pressure.

Altair Forum User

hi，

Do you mean I can creat shell elements with a very small thickness(for example 0.01mm,PSHELL property) over solid elements by find face panel or other panels?

Altair Forum User

Zhang,

 

Yes, correct.

mvass

Yes, I have used it on shell elements. As Prakash said before, you can create shell elements over your solid ones using the faces extraction process: Tool--> Faces    --> Select solid elements or comps--> Find faces. Then you can apply the pressure field on these elements. 

Altair Forum User

Hi @Prakash Pagadala I have been trying this method of applying pressure using linear interpolation and it have not work with a txt file. Is the amount of element has something to do with it. The responses that I am getting is that pressure is not created. Please can you forward a tutorial if possible. Thank you.

Rahul Rajan_21763

Please refer below post.

https://community.altair.com/community?id=community_question&sys_id=2ab604ba1b2bd0908017dc61ec4bcbff

Altair Forum User

Thank you @RAHUL