Simulating convection

Natasha · February 7, 2020, 03:27

Hi,

I'd like to know if there are softwares that can simulate just convection(no diffusion) in a 1D flow

wangsen992 · February 21, 2020, 04:17

Hi Natasha,

What do you mean exactly by 1D flow? Are you solving for u(x, t) or u(x, y, z, t)? For the former case, you can simply hand code the solver (you can refer to https://lorenabarba.com/blog/cfd-pyt...navier-stokes/). For the latter case, you probably mean a pipe flow, doubly wall-bounded flow or a boundary layer flow, for that case, you can either use common CFD softwares (e.g. fluent, openfoam) with a 2D case, or refer to the link above as well. Also depending on your domain size and Reynolds number, you might also need to consider what types of turbulence model you are using.

Hope this helps.

phy4me · February 26, 2020, 06:57

Hi,

In addition...

The convection is modeled using the convective operator, for the Cartesian coordinates it's the x, y, z derivatives. The advection equation is the simplest case that you can try your knowledge on. In this link you can find an example of numerical solution using finite difference.

https://espacephysiquesup.blogspot.c...uation-de.html

LuckyTran · February 27, 2020, 00:24

A lot of programming software have builtin pde solvers that can handle advection problems. Anything with an RK4/RK4-5 can do it as well. Matlab for example.

Светлана · February 27, 2020, 23:19

Matlab - or the free gnu octave which does the same

February 7, 2020, 03:27	Simulating convection	#1
Natasha New Member Natasha Join Date: Jan 2020 Posts: 7 Rep Power: 6	Hi, I'd like to know if there are softwares that can simulate just convection(no diffusion) in a 1D flow

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February 21, 2020, 04:17		#2
wangsen992 New Member Sen Wang Join Date: Jul 2018 Location: Singapore / Notre Dame, U.S. Posts: 19 Blog Entries: 1 Rep Power: 7	Hi Natasha, What do you mean exactly by 1D flow? Are you solving for u(x, t) or u(x, y, z, t)? For the former case, you can simply hand code the solver (you can refer to https://lorenabarba.com/blog/cfd-pyt...navier-stokes/). For the latter case, you probably mean a pipe flow, doubly wall-bounded flow or a boundary layer flow, for that case, you can either use common CFD softwares (e.g. fluent, openfoam) with a 2D case, or refer to the link above as well. Also depending on your domain size and Reynolds number, you might also need to consider what types of turbulence model you are using. Hope this helps.

February 26, 2020, 06:57		#3
phy4me Member C. Ziyad Join Date: Oct 2010 Posts: 37 Rep Power: 15	Hi, In addition... The convection is modeled using the convective operator, for the Cartesian coordinates it's the x, y, z derivatives. The advection equation is the simplest case that you can try your knowledge on. In this link you can find an example of numerical solution using finite difference. https://espacephysiquesup.blogspot.c...uation-de.html

February 27, 2020, 00:24		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	A lot of programming software have builtin pde solvers that can handle advection problems. Anything with an RK4/RK4-5 can do it as well. Matlab for example.

February 27, 2020, 23:19		#5
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	Matlab - or the free gnu octave which does the same