Working with ANSYS surface effect elements

This software supports ANSYS SURF151, SURF152, and SURF154 surface effect elements.

• SURF154 elements are ANSYS structural surface effect elements.

• SURF151 and SURF152 elements are ANSYS thermal surface effect elements.

In ANSYS, surface effect elements are overlaid like a skin on the faces of other 2D or 3D thermal elements. You can use surface effect elements, for example, to generate film coefficients and bulk temperatures from FLUID116 elements and to model radiation to a point. SURF151 and SURF152 elements also have an optional node that you can use to connect those elements with a FLUID116 element. This allows you to base the bulk temperature in convection calculations on a simplified representation of the fluid flow.

Creating surface effect elements in Pre/Post

Depending on the type of surface effect element, you can either create them manually or you can have this software create them automatically during the export process.

• You can manually create SURF152 and SURF154 elements in the FEM file. You may want to manually create the elements when you want to group them or display them in Pre/Post. For more information, see Manually creating surface effect elements.Note: You cannot manually create SURF151 (thermal) surface effect elements in Pre/Post.

• You can have Pre/Post create SURF151, SURF152, and SURF154 elements automatically when you export the input file.To have the software automatically create these elements during the export process, you must select the Automatic Creation of Surface Effect Elements check box when you create the appropriate boundary condition.

Specifying Real Constants and KEYOPTS for surface effect elements

In ANSYS, you can define additional properties for SURF151, SURF152, and SURF154 elements with real constants and KEYOPTS. In Pre/Post, you define these additional properties with:

• The SURF151 ET, SURF152 ET, and SURF154 ET modeling objects, which let you set the KEYOPTS for the elements.

• The SURF151 RC, SURF152 RC, and SURF154 RC modeling objects, which let you set the real constants.

Applying thermal loads and constraints to SURF151 and SURF152 elements

With this software, you can use the Automatic Creation of Surface Effect Elements option in the Heat Flux, Heat Generation, or Convection dialog boxes to apply those boundary conditions to SURF151 or SURF152 elements. You can also use the Connect to FLUID116 elements option to attach the SURF151 or SURF152 elements to FLUID116 elements.

For more information, see:

• Defining the rate of heat flux

• Defining the rate of heat generation

• Defining convection constraints

• Working with ANSYS FLUID116 elements

Applying a flame temperature to SURF152 elements

You can use the Use radiation to apply flame temperature on SURF152 extra node option in the Solution dialog box to define the radiation effect of a flame on a surface, given the temperature of the flame and the emissivity of the surface. The software creates SURF152 elements in your ANSYS input file. These SURF152 elements are overlaid on the element faces you selected in the Radiation dialog box. Each SURF152 element as an extra node at the center of each element’s face where ANSYS applies the specified Ambient Temperature as the flame temperature.

For more information, see Applying a flame temperature to SURF152 elements.

Importing surface effect elements into Pre/Post

Use the Import surface effect/contact elements in FEM option in the Import Simulation dialog box to control whether Pre/Post imports surface effect elements into a FEM file. If you do not select this option, the software imports them into the Simulation file and associates the them with the appropriate boundary condition.

How do I

Manually creating surface effect elements

Manually creating contact elements

Create an ANSYS KEYOPT table

Learn more

ANSYS environment

Applying a flame temperature to SURF152 elements

Working with ANSYS FLUID116 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 surface effect elements, Simcenter 3D 2021.1 Series

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