Solver calculation for duct elements

The approach that the thermal solver uses to calculate the 1D mass flow in duct networks is analogous to the finite difference approach that it uses to calculate heat transfer.

Thermal	Flow
Heat flow	Mass flow: ṁ = ρV**A
Thermal resistance	Fluid resistance: Resistanceij = (Ptotal,i - Ptotal,j)/ṁ
Temperature	Pressure: Pdynamic = Ptotal - Pstatic = ρV2/2

For the 1D fluid network, the thermal solver:

• Conserves the mass flow.

• Uses the element's length and average cross section as the control volume.

• Uses the midpoint of each duct element as the calculation point.

• Creates additional 1D thermal elements to model the duct walls when requested.

• Uses correlations for laminar, developing, and fully developed turbulent flows in forced convection conditions. These correlations depend on flow conditions (Reynolds, Prandtl, Rayleigh numbers) which are determined by the solver.

How do I

Create a duct flow network

Create a thick wall duct flow network

Create a pressureless duct network

Create a duct flow network and model heat transfer using 2D shells

Create a duct flow network and model heat transfer using 3D solid elements

Connect the duct network to the 3D flow domain

Learn more

1D duct flow networks

Duct analysis workflow

Duct Flow Boundary Conditions

1D meshing

Ensuring consistent 1D element orientation during mesh creation

Look up more details

Modeling ducts with 1D elements

Modeling ducts and their walls with 1D elements

Modeling ducts with 1D elements and their walls with 2D elements

Modeling the interface between ducts and 3D fluid elements

Modeling ducts inside 3D solid elements

Understanding ducts and area definition

Solver calculation for duct with mass flow elements

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

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

Solver calculation for duct elements, Simcenter 3D 2021.1 Series

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