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Viewing 8 posts - 1 through 8 (of 8 total)
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• in reply to: Smooth start curve in aorta3d #2583
happyday
Member

OK,think you

in reply to: Smooth start curve in aorta3d #2581
happyday
Member

Think you,
Mathias
set the latticeVelocity?How? In LBconverter,the latticeVelocity=1

Best Gao

in reply to: Smooth start curve in aorta3d #2579
happyday
Member

Think you,Mathias

I have another question for this code.In the code,the physical inlet velocity=maxVelocity=charU.But in the LBconverter, physVelocity=charU / latticeU * latticeVelocity,that means physical inlet velocity is not the physVelocity in LBconverter?

Best
Gao

in reply to: thermal fluid and conjugate heat transfer #2553
happyday
Member

Hi Max,

In olb::AdvectionDiffusionUnitLB< T, NSLattice, ADLattice >::getTcold ( ) const,ithe temperature is dimensionless Temperature? I do some test in example thermal3d with Thot=1000 Tcold=288.15,it seems it works well.

Best Gao

in reply to: thermal fluid and conjugate heat transfer #2552
happyday
Member

Hi Max,

I got it,you save a lot time for me,thanks.

Best,Gao

in reply to: thermal fluid and conjugate heat transfer #2541
happyday
Member

Holle Max,

Thanks for your working for next release version! I hope it comes soon.For now,how can i do it in my code?I just know the dimensionless Temperature = (T – T_lowest) / (T_highest – T_lowest).Yes, I find my lack of theoretical knowledge,and in recent days, I am reading the book The Lattice Boltzmann Method Principles and Practice

Best,Gao

in reply to: thermal fluid and conjugate heat transfer #2545
happyday
Member

Think you Max,

You save a lot time for me,I would add this in my codes.In recent days,I almost finish my coding,and I find it is difficult for me to set up boundary values.

Well,I konw the T is the dimensionless Temperature = (T – T_lowest) / (T_highest – T_lowest), so usually the colder one will be 0 and the highest 1.but how can I set T_highest and T_lowest ?Are they physical parameters?And how about the different values of thermal conductivity in fluid and solid?In the function in AdvectionDiffusionUnitLB:getKappa=sqrt((T)1/(getPr()*getRa()))*getDeltaT()/(getDeltaX()*getDeltaX()),it seems there is no difference between fluid and solid.

Parameters are connected in lattice world ,and it is not easy to converter physical parameters to lattice parameters especially for my research which has 6 different speed and temperature boundary inlets.I use LBconverter<T> converter1 and AdvectionDiffusionUnitLB<T,NSDESCRIPTOR,TDESCRIPTOR> converter at same time. LBconverter for
converting lattice velocity to physical velocity and AdvectionDiffusionUnitLB for temperature.Is it okey?

Best Gao

in reply to: thermal fluid and conjugate heat transfer #2539
happyday
Member
Quote:
Quote from mgaedtke on February 17, 2017, 13:03
Hello happyday,

Have a look for the thermal2d or thermal3d example cases. You can see the thermal dynamics coupled via the boussinesq approximation already set up in order to simulate the raighley benard convection.

This model is not capable of simulating internal heat sources so far, but by applying certain boundary conditions you can simulate heat input to the system.

I did some test with conjugated heat transfer by simply defining another material number with another thermal dynamics using a different diffusion coefficient than the fluid. If you are interested in this setup I can send you some more details.

Best, Max

Thank you Max,I will read the code of the thermal2d or thermal3d carefully,and I would appreciate it if you send the details for me 🙂 .Here is my Gmail:gaobo3698741@gmail.com.

Best Gao

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