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Star ccm+ case analysis, I believe that many inexperienced people do not know what to do about this, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

Today brings you a simple Star ccm+ exhaust manifold fluid-solid coupling tutorial case, the condition is compressible flow, and set up heat transfer analysis, through this case to roughly understand the whole simulation process of Star ccm+, and make a preliminary understanding of Star ccm+.

I. carry out body grid generation

❉ surface treatment

▶ separates contact surface and fills loophole

Import the surface mesh model, enter the surface repair module, and extract the internal fluid domain volume.

Create a new contact surface interface, fill the exit, and create a face outlet, fill 4 entrances, and create a face runner

Deal with breaklines, eliminate unnecessary breaklines, and improve mesh quality

▶ detach component

After the operation is completed, exit the surface repair, and you can see the newly generated surface in Parts.

The runner is divided into discontinuities-Split Non-Contiguous to generate four separate exit surfaces.

Split the exhaust parts according to the topology-Split by Surface Topology, and rename the newly generated 2 zero parts to solid,gas

You can view the generated solid domain, gas domain, and contact surface

❉ generates grids

▶ allocation area

Assign parts to regions, select fluids and solids, generate regions for each part, generate faces for each boundary, after adding, open the boundaries of the region, you can see the existence of contact surfaces interface in both solids and gases

Change the Fluid Region property of the solid to Solid Region

The four inlets at the boundary of the gas domain are set as mass flow inlets.

The gas domain outlet is set as the pressure outlet

▶ selects the grid type and sets the parameters

According to the conditions, the numerical value of the grid model is changed appropriately to control the grid generation.

Create a new grid type, select a grid type, and change some options and overall reference values for the grid model

Select Grid Typ

Change the model section settings

Modify reference item

Modify valu

Surface Remesher

> cancel Enable automatic surface repair

> cancel Do proximity refinement

Base Size > Valve:

5 mm

Polyhedral Mesher

Prism Layer Thickness

Absolute Size:1 mm

Prims Layer Mesher

Surface Size

Min: 50% of base

Max: 100% of base

Embedded Thin Mesher

Check Custom thickness threshold

Thin Solid Thickness

100% of base

The solid domain does not need boundary layer optimization, so cancel the definition of the boundary mesh and choose to execute the boundary layer grid at the interface.

▶ parameters are set and volume meshes are generated.

Generated volume mesh

First, set the solution conditions and run the solution.

❉ selects the physical model

After the grid generation is completed, according to the calculation situation, the appropriate physical model is selected for the solid domain and the gas domain. Automatic selection is checked by default, and some models will be selected automatically.

Physical model of gas domain

Physical model of solid domain

Three Dimensional

Three Dimensional

Steady

Steady

Gas

Solid

Segregated Flow

Segregated Solid Energy

Ideal Gas

Constant Density

Segregated Fluid Temperature

Cell Quality Remediation

Turbulent

K-Epsilon Turbulence

The default material for solid domain is aluminum, which is modified to carbon steel.

❉ defines initial conditions

▶ setting physical model initial condition setting

Air & Carbon Steel:

▶ confirms the continuum model of the region. The gas domain is Air and the solid domain is Carbon Steel.

▶ modifies boundary conditions

Modify the boundary properties and physical values of gas and solid domains

Gas domain

Boundaries

Mass Flow Rate

Total Temperature

Turbulence Intensity

Turbulent Viscosity Ratio

Runner4

0.05 kg/s

514.5 C

0.1

10.0

Runner-Runner 3

0.001 kg/s

500 C

0.1

10.0

Solid domain

Manifold

The Thermal Specification

Ambient Temperature

Heat Transfer Coefficient

Convection

75 C

50W/ (massik)

Control the energy sub-relaxation factor and set the maximum number of iterative steps

❉ creates monitoring reports and scenes

▶ gas / solid mass average temperature: Averaged Gas/Solid Temperature

Created by the same method, distinguishing the displayed area

▶ scalar display scene

According to the boundary Manifold, Interface [Gas/Solid], the scalar scene of temperature function is established.

According to the boundary Manifold, select the function Wall yearly to build the scene.

❉ running solution

During the ▶ solution, you can view the convergence of the iterative curve or the monitoring scenario created above

Second, post-processing view

▶ creates an empty scene Empty scene

Drag and drop the two generated Scene Image into a new scene and arrange them.

Modify the view in the original scene, and the inner view of Scene Image will also be changed.

After reading the above, have you mastered the method of Star ccm+ case analysis? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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