Working with ANSYS FLUID116 elements

In the ANSYS thermal environment, you can create FLUID116 elements from the 1D Mesh dialog box. The FLUID116 element is a coupled thermal-fluid pipe element. It can conduct heat and transmit fluid between its primary (required) nodes.

The FLUID166 element has two required nodes and two additional optional nodes that are necessary to define convection. When you create a mesh of FLUID116 elements from the 1D Mesh dialog box, the software automatically creates the two required nodes for each element. You can then define the optional nodes (K and L) in the Mesh Associated Data dialog box.

Specifying Real Constants and KEYOPTS

In ANSYS, you can define additional properties for FLUID116 elements with real constants and KEYOPTS. In Pre/Post, you define these additional properties with:

• The FLUID116 ET type of modeling object, which lets you set the KEYOPTS.This software currently does not support specification of the following coefficients as material properties. The film coefficient (MP, HF or TB, HFLM).The fluid conductance coefficient (TB, FCON)The coefficient of friction (MP, MU).Therefore, in the FLUID116 ET dialog box, in the KEYOPT(4), KEYOPT(6), and KEYOPT(7) lists, if you select an option that depends on those material property values, you must manually add those properties to your ANSYS input file with a User Defined Text modeling object.

• The FLUID116 physical property table, which lets you set the real constants for the element.

Using FLUID116 elements to define thermal loads and constraints

You can use the Connect to FLUID116 elements option in the Heat Flux, Heat Generation, and Convection dialog boxes to attach SURF151 or SURF152 elements to FLUID116 elements.

When FLUID116 elements are connected to SURF152 elements, this software uses the closest node of the FLUID116 element to connect to the SURF152 element. It computes the distance between the nodes in cylindrical space using the RZ plane. To compute the distance, the software temporarily rotates the FLUID116 node around the Y-axis to the same position as the SURF152 element.

Note:

The RZ space calculation does not apply when the underlying elements are planar (PLANE182 and PLANE183).

To deactivate the RZ space transformation and have the software compute the distance in Cartesian space, use the UGII_CONNECT_FLUID116_XYZ environment variable.

For more information, see:

• Defining the rate of heat flux

• Defining the rate of heat generation

• Defining convection constraints

• Working with ANSYS surface effect elements

How do I

Manually creating surface effect elements

Manually creating contact elements

Create an ANSYS KEYOPT table

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ANSYS environment

Working with ANSYS surface effect elements

Applying a flame temperature to SURF152 elements

Working with ANSYS MASS21 elements

Working with ANSYS SOLID186 and SOLID187 elements

Working with ANSYS SOLID 272 and SOLID 273 elements

Working with ANSYS contact elements

Working with ANSYS MESH200 elements

Modeling cohesive zones with ANSYS interface elements

Specifying user defined KEYOPTs for ANSYS

Requesting output for ANSYS analyses

Previewing ANSYS solver syntax

Customizing ANSYS input files with user defined text

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ANSYS elements

Using ANSYS high performance computing options

ANSYS boundary conditions

Working with ANSYS FLUID116 elements, Simcenter 3D 2021.1 Series

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