## 3D Design

#### Vertical tube modelling

• daveberutu
Subscriber

Hello everyone, I am modelling an inconel 625 tube that use to transport NaOH from a surface to a geothermal production well as deep as 6200 ft. I model the tube as concentric pipe as NaOH on the inner pipe and steam with variation quality on the outer pipe. I confuse how to model the pressure load as we know than the pressure is not uniform along the pipe for both fluid. Can you help how to solve this situation? Before, I attach our discussion results to give you the description of the situation.

Your help will be much appreciated.

• Rob
Ansys Employee

Are you modelling the fluid system or mechanical stresses?

• daveberutu
Subscriber

Mechanical stresses Sir
Is line body modelled is the best method to achieve the results?

• peteroznewman
Subscriber

Here is a Mechanical analysis of heat transfer from fluid flowing in a pipe modeled using line bodies.  You might use some of the methods in that model for your model.

• daveberutu
Subscriber

Wow, thank u for the example Mr. Peter

But back to my main question, How can I model the pressure distribution along the pipe?

• daveberutu
Subscriber

I forget to say that the pressure doesn't vary linearly along the pipe

• peteroznewman
Subscriber

Can you write an equation for the pressure along the pipe in terms of one or more of the global coordinate values?  If so, you can use that equation in the pressure boundary condition.

• daveberutu
Subscriber

How about using tabular data with tube axis as a variable. So I'll define the value of pressure in some coordinate with spesific increment.

• peteroznewman
Subscriber

If you have the tube axis in X,Y,Z coordinates, you can extract the pressure along the tube axis in X,Y,Z coordinates.