Flow Blockage

Create a Flow Blockage simulation object to force the flow around a solid object or through a fluid region with a specified head loss (pressure drop). In general, you apply a Flow Blockage to bodies meshed with 3D elements. You can also apply them to unmeshed bodies that are in contact with a 3D flow mesh.

You can create the following types of the Flow Blockage simulation object:

• Solid Blockage

• Porous Blockage — Isotropic

• Porous Blockage — Orthotropic

Solid flow blockages

Use a solid blockage to model a 3D obstruction that blocks the 3D flow and (in most cases) exchanges heat with the fluid by convection at its polygon faces. As the fluid passes around the obstruction, you can also model surface drag and turbulence.

The body that you select when you create a solid blockage must be meshed with 3D elements, which have solid material properties assigned to them. You must use mesh mating between the 3D solid mesh and the 3D flow mesh.

By default, all solid blockages convect to the fluid, using default convection properties defined in the 3D Flow page in the Solution dialog box.

Porous flow blockages

Use a porous flow blockage to model obstructions which impede the flow but do not entirely block the flow. When you define an isotropic porous flow blockage, the obstruction impedes the flow equally in all directions. When you define an orthotropic porous flow blockage, the obstruction impedes flow differently in the three orthogonal directions.

The body that you select when you create a porous flow blockage must be meshed with 3D elements, which have fluid material properties assigned to them.

Note:

The porous flow blockage cannot convect heat to or from the fluid.

• In a system level analysis, typical applications of porous flow blockages include components or mechanisms having complex geometry through which flow passes with a known head loss.

• In a component level analysis, typical applications of porous flow blockage include 3D filters (for the isotropic case) or filters with orthotropic head loss (for the orthotropic case).

Where do I find it?

Application	Pre/Post
Command Finder	Flow Blockage
Simulation Navigator	Right-click the Simulation Object Container node→New Simulation Object→Flow Blockage

How do I

Create a Flow Blockage

Learn more

Using a Flow Blockage with other types of boundary conditions

Understanding Porous Flow Blockage resistance methods

Inputs to expressions

Look up more details

Auto-generated expressions

Meshing for turbulence modeling

Quick links

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Flow Blockage, Simcenter 3D 2021.1 Series

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