Create and Customize Your Physical Models

7/28/2019 Create and Customize Your Physical Models

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1

Numeca Russia

User Meeting 2011

FINETM /Open

OpenLabs in FINETM /Open:Create and customize your physical models

Kilian Claramunt, Yingchen Li, Jan E. Anker, Nijso Beishuizen,

Dirk Wunsch, Thomas Deconinck, Selvan Gnanakumaran



2 Numeca Russia User Meeting 2011

Motivation

Industrial applications usually involve multiple physical

phenomena

Users should be allowed to adapt and/or add modeling capabilities

in a flexible, efficient and user-friendly way ... … without programming Fortran or C++ code

Combustion, radiation,

pollutant formation, CHT,…

Multiphase flows, e.g. cavitation




OpenLabs

OpenLabs allows users to customize or add physical models in a

flexible and a user-friendly GUI

Users don’t need to care about programming details and code

structure Users benefit from NUMECA’s CFD industrial environment and

features (HPC, parallelization, meshing capabilities, advanced

numerical methods)

OpenLabs can be used in a wide variety of industrial and academic

applications Compared to source-coded models, CFD solutions are obtained

with identical computing and memory costs

Free access for all FINETM /Open community






OpenLabs’ functionalities in FINETM /Open 2.11 allow

addition/customization of models for

Initial field customization, e.g. initial free surface position for a VOF simulation

Boundary conditions, e.g. unsteady inlet boundary conditions

Turbulence modeling, e.g. realizable k-ε model, round/jet anomaly correction

Mass diffusion to track pollutant concentration

Steady or unsteady source terms, e.g. time-dependent heat source

… and many more!

OpenLabs




OpenLabs in FINETM /Open 2.12 will include

GUI to introduce the physical models

Library built by a simple click in the GUI and automatically loaded by theflow solver

The process is automatized and fully integrated in the FINETM/Open

environment

Customization of thermal and transport properties

Access to the combustion and radiation modules Multi-block with similar physical models; access to solid block customization

OpenLabs under Windows platform

OpenLabs


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OpenLabs’ functionalities in FINETM /Open 2.12 will allow

addition/customization of models for

Combustion and radiation, e.g. radiation optical properties, soot formation

Multi-phase flows, e.g. droplet condensation model (currently being

implemented), cavitation models,…

Heat source term added to a solid block

… and many more!!!

OpenLabs



How?

Set up your test case withFINETM /Open

Add/customize

your physicalmodel withOpenLabs’

GUI

Create thelibrary with asimple click in

OpenLabs

Launch theflow solver of FINETM /Open

Analyze and

post-processthe results

withCFViewTM



OpenLabs - Examples of applications.

Managing initial conditions



=>INITIAL_PROFILES

@ INITIAL_FIELD: Initial_VelocityX

->EXPRESSION:

->ExistingField: Vx

@ INITIAL_FIELD: Initial_VelocityY

->EXPRESSION:

->ExistingField: Vy

=>AUXTERMS

Imposing initial field for Vx and Vy to follow geometry initialization

Customize initial conditions.

Imposing initial velocity field

r

=>INITIAL_PROFILES


->EXPRESSION: IF(xCoord<0.1) 1.0 \

ELSEIF(yCoord>2.65) 0.0 \

ELSE cos(asin((xCoord-0.1)/r))

->ExistingField: Vx


->EXPRESSION:

->ExistingField: Vy

=>AUXTERMS

=>INITIAL_PROFILES





->ExistingField: Vx




ELSE sin(asin((xCoord-0.1)/r))

->ExistingField: Vy

=>AUXTERMS

=>INITIAL_PROFILES





->ExistingField: Vx




ELSE sin(asin((xCoord-0.1)/r))

->ExistingField: Vy

=>AUXTERMS

@ r=sqrt((xCoord-0.1)*(xCoord-0.1)+ (yCoord-2.65)*(yCoord-2.65))

Velocity field at

zero iterations




Managing boundary conditions



To simulate the effect of upstream wake of the vane, the relative total

pressure is fitted and placed as boundary condition at the inlet of the rotor

The formula is dependent on the physical time t

Customize Boundary Conditions.

Unsteady inlet boundary to the GE-E3 blade

Stator

Po-bg total pressure at inlet, 223332.0 (Pa)

n number of blades which is 76 Ω rotation speed, 8283rpm

τ time period for one wake passage,

Rotor





=>AUXTERMS

@ n = 76

@ omega = 8283

@ P0_bg = 223331.0

@ PI = 3.1415926535

@ Period = 60.0/(omega*n)

Po-bg total pressure at inlet, 223332.0 (Pa)

n number of blades which is 76

Ω rotation speed, 8283rpm

τ time period for one wake passage,

=>AUXTERMS

@ n = 76

@ omega = 8283

@ P0_bg = 223331.0

@ PI = 3.1415926535

@ Period = 60.0/(omega*n)

=>CUSTOM_BOUNDARY_CONDITIONS

@ CUSTOMIZED_BOUNDARY_CONDITION: PtInlet

->EXPRESSION: P0_bg * (1.0 - 0.15 * pow((sin(n*tCoord/2+PI*Time/Period)),10))

->ExistingBC: "Absolute Total Pressure" , rotor_inlet





Simulation over one period




Managing additional transport equations

and source terms



Diffusion of a pollutant in a room

Transport equation and source terms.


Window

outlet

AC inletPOLLUTANT

Cold Temperature

Door inletAIR

Warm Temperature

The pollutant isheavier than air



Modeling approach in an incompressible flow

Transport equation for the pollutant mass fraction

Density is considered constant except for the buoyancy term in themomentum equation (Boussinesq approx.)

The solutal buoyancy source term has to be added to the momentum equation



Thermal buoyancy

already in

FINETM /Open

Solutal buoyancy to

be added with

OpenLabs

βT is the thermal

expansion coeff.

βS is the solutal

expansion coeff.





=>CONSTANTS

@ solutalExpansion = 0.14372@ Le = 1.0

@ SigmaY = 1.0

@ YRef = 0.0

@ gravityX = 0.0

@ gravityY = 0.0

@ gravityZ = -9.8

βS solutal expansion coeff.

Lewis number assumed unity

Reference mass fraction

Turbulent Prandtl number

Gravity







=>SOURCETERMS

@ SOURCE: sourceToMomX

->EXPRESSION: Density * ( solutalExpansion*(Y-YRef)) * gravityX

->AddToExistingPde: MomentumXEquation

@ SOURCE: sourceToMomY

->EXPRESSION: Density * ( solutalExpansion*(Y-YRef)) * gravityY

->AddToExistingPde: MomentumYEquation

@ SOURCE: sourceToMomZ

->EXPRESSION: Density * ( solutalExpansion*(Y-YRef)) * gravityZ

->AddToExistingPde: MomentumZEquation

Source term to the

momentum equationThermal buoyancy

already in

FINETM /Open

Solutal buoyancy to

be added with

OpenLabs




OpenLabs.

Demonstration




OpenLabs.

Demonstration




OpenLabs.

Demonstration






Y




OpenLabs - Other applications




Initial free surface position for an unsteady VOF simulation

Broken Dam: water column; dam removed at start of the analysis

Evolution of the wave shape with time

The initial position of the free surface is prescribed with OpenLabs

OpenLabs.

Other applications

Thickness of the interface

Distance function

Distance function

C = 0

C = 1

(xLim,yLim)




Turbulence modeling

The Low-Re Yang-Shih k-ε turbulence model is available in FINETM/Open

As a validation exercise, the same model has been fully added with OpenLabs

Identical results are obtained using FINETM/Open and OpenLabs models

Results are shown for the turbulent flat plate: profiles of Vx and k at the outlet

OpenLabs.

Other applications




Soot formation model

Combustion and radiation models are already available in FINETM/Open

Soot strongly effects the radiation absorption coefficient and therefore the

radiative heat transfer

Soot formation models have been added with OpenLabs

The transport equation for the soot mass fraction with

the nucleation and oxidation source terms is added

The absorption coefficient of the radiation model is is

modified to take into account soot

OpenLabs.

Other applications (cont.)




OpenLabs libraries will be progressively shared with all FINETM /Open

community with a variety of functionalities and applications:

You are very welcome to share your experience and extend the

OpenLabs library !!!!

OpenLabs.

Conclusions

Type of functionality

How to customize initial

solutionsHow to customize boundary

conditions

How to add/modify source

terms in a transport equation

How to add transport equations

…

Application / Physical

modeling

Turbulence modeling

Combustion modeling

Radiation modeling

Multiphase modeling

BC customization

…



Thank you for your attention!

Documents

Create and Customize Your Physical Models