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Help in fluid flow, for beginner

Posted 7 dic 2010, 15:48 GMT-5 Fluid & Heat Version 4.0a 14 Replies

Mohamed Aref
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Hello

I got comsol from only week, and comsol help
and now i know how to build model by geometry section, and set parameters

i will use comsol in my graduation project, which in fluid flow dep.

i search for any example to learn how to build model and set parameters and materials, ....
and finally simulate my design and get results

Can any one help me ?

thanks.
14 Replies Last Post 11 dic 2010, 15:00 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 7 dic 2010, 16:13 GMT-5
Hi

The best to start is really to read the doc (a few times, it's hard the first time, so do it in not too long sections)
Then go into the model library, print out the pdf files (v4.1) of the examples and follow them step by step. Start with simple examples in one physics, later start to couple two physics. Often starting in 2D before going to 3D. Note that 2D means in fact 3D physics but the third dimension is set typically to 1[m] so everything is expressed in "per meter"

Note that fluidics is already a tricky physical domain to simulate and require quite some prior knowledge, so often it's simpler to start with structual or thermal before going into CFD models. CFD models are also quickly heavy and require longer time to solve (if they converge)

--
Good luck
Ivar
Hi The best to start is really to read the doc (a few times, it's hard the first time, so do it in not too long sections) Then go into the model library, print out the pdf files (v4.1) of the examples and follow them step by step. Start with simple examples in one physics, later start to couple two physics. Often starting in 2D before going to 3D. Note that 2D means in fact 3D physics but the third dimension is set typically to 1[m] so everything is expressed in "per meter" Note that fluidics is already a tricky physical domain to simulate and require quite some prior knowledge, so often it's simpler to start with structual or thermal before going into CFD models. CFD models are also quickly heavy and require longer time to solve (if they converge) -- Good luck Ivar
Mohamed Aref
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Posted: 1 decade ago 8 dic 2010, 13:01 GMT-5

Hi

The best to start is really to read the doc (a few times, it's hard the first time, so do it in not too long sections)
Then go into the model library, print out the pdf files (v4.1) of the examples and follow them step by step. Start with simple examples in one physics, later start to couple two physics. Often starting in 2D before going to 3D. Note that 2D means in fact 3D physics but the third dimension is set typically to 1[m] so everything is expressed in "per meter"

Note that fluidics is already a tricky physical domain to simulate and require quite some prior knowledge, so often it's simpler to start with structual or thermal before going into CFD models. CFD models are also quickly heavy and require longer time to solve (if they converge)

--
Good luck
Ivar


FIRST, thank you very much
but i don't understand what is the document you tell me about ?

i know that the examples is the direct way to get good experience, but where is it ?
i search for fluid flow examples, but i didn't find any thing.

can you attach fluid flow examples ?
thanks.
[QUOTE] Hi The best to start is really to read the doc (a few times, it's hard the first time, so do it in not too long sections) Then go into the model library, print out the pdf files (v4.1) of the examples and follow them step by step. Start with simple examples in one physics, later start to couple two physics. Often starting in 2D before going to 3D. Note that 2D means in fact 3D physics but the third dimension is set typically to 1[m] so everything is expressed in "per meter" Note that fluidics is already a tricky physical domain to simulate and require quite some prior knowledge, so often it's simpler to start with structual or thermal before going into CFD models. CFD models are also quickly heavy and require longer time to solve (if they converge) -- Good luck Ivar [/QUOTE] FIRST, thank you very much but i don't understand what is the document you tell me about ? i know that the examples is the direct way to get good experience, but where is it ? i search for fluid flow examples, but i didn't find any thing. can you attach fluid flow examples ? thanks.
nancy Gutierrez
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Posted: 1 decade ago 8 dic 2010, 13:55 GMT-5
Hi mohamed, I'm a beginner & need flow simulation help too, so If I find something interesting while lerning comsol be sure i'll share U, Would U do the same? Good look & thank's
Hi mohamed, I'm a beginner & need flow simulation help too, so If I find something interesting while lerning comsol be sure i'll share U, Would U do the same? Good look & thank's
nancy Gutierrez
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Posted: 1 decade ago 8 dic 2010, 13:57 GMT-5
I think the same way Mohamed, I've the documentation whit a lot of examples but I?d like to fin flow examples in order to understand it better
I think the same way Mohamed, I've the documentation whit a lot of examples but I?d like to fin flow examples in order to understand it better
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 8 dic 2010, 14:49 GMT-5
Hi

have you tried (for >=v4.1) to select the model library, find a simple example, print out the pdf file and go through it step by step and cross checking with the doc for each step, to reall understand the step by step apprch. It's tedious but very efficient. An even better approach is to get on one of the COMSOL courses (start with befginners level;) but these are not always available everywhere

--
Good luck
Ivar
Hi have you tried (for >=v4.1) to select the model library, find a simple example, print out the pdf file and go through it step by step and cross checking with the doc for each step, to reall understand the step by step apprch. It's tedious but very efficient. An even better approach is to get on one of the COMSOL courses (start with befginners level;) but these are not always available everywhere -- Good luck Ivar
Mohamed Aref
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Posted: 1 decade ago 8 dic 2010, 23:15 GMT-5

Hi

have you tried (for >=v4.1) to select the model library, find a simple example, print out the pdf file and go through it step by step and cross checking with the doc for each step, to reall understand the step by step apprch. It's tedious but very efficient. An even better approach is to get on one of the COMSOL courses (start with befginners level;) but these are not always available everywhere

--
Good luck
Ivar


i agree with you, but now i want to get these examples
where ? tell me, please.

-------------------

if you can make simulations for fluid flow, give me the materials which aids you, with thanks.

[QUOTE] Hi have you tried (for >=v4.1) to select the model library, find a simple example, print out the pdf file and go through it step by step and cross checking with the doc for each step, to reall understand the step by step apprch. It's tedious but very efficient. An even better approach is to get on one of the COMSOL courses (start with befginners level;) but these are not always available everywhere -- Good luck Ivar [/QUOTE] i agree with you, but now i want to get these examples where ? tell me, please. ------------------- if you can make simulations for fluid flow, give me the materials which aids you, with thanks.
Mohamed Aref
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Posted: 1 decade ago 8 dic 2010, 23:17 GMT-5

Hi mohamed, I'm a beginner & need flow simulation help too, so If I find something interesting while lerning comsol be sure i'll share U, Would U do the same? Good look & thank's


sure, thank you for your help
[QUOTE] Hi mohamed, I'm a beginner & need flow simulation help too, so If I find something interesting while lerning comsol be sure i'll share U, Would U do the same? Good look & thank's [/QUOTE] sure, thank you for your help
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 9 dic 2010, 02:18 GMT-5
Hi

have you tried "File - Open Model Library" and looked for the examples there ? (the amount of stuff depends on the number of toolboxes you have a licence for)

For the rest I take my schoolboks and run through the examples, but first one need to really udnerstand what COMSOl is doing as well as its conventions, and that one can only learn by openin the library model, and select show pdf -> print and repeat the instructions therein

--
Good luck
Ivar
Hi have you tried "File - Open Model Library" and looked for the examples there ? (the amount of stuff depends on the number of toolboxes you have a licence for) For the rest I take my schoolboks and run through the examples, but first one need to really udnerstand what COMSOl is doing as well as its conventions, and that one can only learn by openin the library model, and select show pdf -> print and repeat the instructions therein -- Good luck Ivar
Mohamed Aref
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Posted: 1 decade ago 9 dic 2010, 06:00 GMT-5

Hi

have you tried "File - Open Model Library" and looked for the examples there ? (the amount of stuff depends on the number of toolboxes you have a licence for)

For the rest I take my schoolboks and run through the examples, but first one need to really udnerstand what COMSOl is doing as well as its conventions, and that one can only learn by openin the library model, and select show pdf -> print and repeat the instructions therein

--
Good luck
Ivar


Ok, you mean that i open library examples and try to understand them.
IS here any helpful PDF help my o understand fluid flow, specialist in fluid flow models and simulations

I'm sorry, you are tired with me
[QUOTE] Hi have you tried "File - Open Model Library" and looked for the examples there ? (the amount of stuff depends on the number of toolboxes you have a licence for) For the rest I take my schoolboks and run through the examples, but first one need to really udnerstand what COMSOl is doing as well as its conventions, and that one can only learn by openin the library model, and select show pdf -> print and repeat the instructions therein -- Good luck Ivar [/QUOTE] Ok, you mean that i open library examples and try to understand them. IS here any helpful PDF help my o understand fluid flow, specialist in fluid flow models and simulations I'm sorry, you are tired with me
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 9 dic 2010, 07:27 GMT-5
Hi

not fully yet ;)

in my V4.1 (and I belive this was also so for the 4.0a, not sure, but anhow try to get hand on a 4.1 it's better documented and more stable) you will see two options for your library models: a pdf file generation (= your doc to read) and the model itself

--
Good luck
Ivar
Hi not fully yet ;) in my V4.1 (and I belive this was also so for the 4.0a, not sure, but anhow try to get hand on a 4.1 it's better documented and more stable) you will see two options for your library models: a pdf file generation (= your doc to read) and the model itself -- Good luck Ivar
Mohamed Aref
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Posted: 1 decade ago 9 dic 2010, 07:57 GMT-5

Hi

not fully yet ;)

in my V4.1 (and I belive this was also so for the 4.0a, not sure, but anhow try to get hand on a 4.1 it's better documented and more stable) you will see two options for your library models: a pdf file generation (= your doc to read) and the model itself

--
Good luck
Ivar


Ok
can you give me model pdfs ?
[QUOTE] Hi not fully yet ;) in my V4.1 (and I belive this was also so for the 4.0a, not sure, but anhow try to get hand on a 4.1 it's better documented and more stable) you will see two options for your library models: a pdf file generation (= your doc to read) and the model itself -- Good luck Ivar [/QUOTE] Ok can you give me model pdfs ?
Mohamed Aref
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Posted: 1 decade ago 10 dic 2010, 11:24 GMT-5
can any one help me ?
can any one help me ?
Ruud Borger COMSOL Employee

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Posted: 1 decade ago 11 dic 2010, 09:02 GMT-5
Hi Mohamed,

A good way to get started, as Ivar says, is to open the Model Library. Click on File, then "Open Model Library". Go to the CFD or Fluid Flow folder, and view a few models. For each model, there's an option "Open PDF", which will open a document describing the model.

If you want to know more, read the User's guide. Go to C:/Comsol41/doc/pdf/CFD and open the PDF.

Start simple.

It's good to keep your flow in the laminar region. Read on Wikipedia what the difference is between laminar and turbulent flow - keep the Reynold's number below ~1500.

Start in 2 dimensions; it's easier and will not put very large strains on your memory. Start by building a rectangle of 0.02m wide and 0.1 m long. Choose air as material. Make the left boundary an "inlet" condition at 0.1 m/s. Set the right boundary as "Outlet", pressure = 0 Pa. Set up your mesh fine and if possible, use boundary layers. If you're using Comsol v4.1, boundary layers will automatically be applied to ensure a reliable solution.

Good luck and have fun!
Hi Mohamed, A good way to get started, as Ivar says, is to open the Model Library. Click on File, then "Open Model Library". Go to the CFD or Fluid Flow folder, and view a few models. For each model, there's an option "Open PDF", which will open a document describing the model. If you want to know more, read the User's guide. Go to C:/Comsol41/doc/pdf/CFD and open the PDF. Start simple. It's good to keep your flow in the laminar region. Read on Wikipedia what the difference is between laminar and turbulent flow - keep the Reynold's number below ~1500. Start in 2 dimensions; it's easier and will not put very large strains on your memory. Start by building a rectangle of 0.02m wide and 0.1 m long. Choose air as material. Make the left boundary an "inlet" condition at 0.1 m/s. Set the right boundary as "Outlet", pressure = 0 Pa. Set up your mesh fine and if possible, use boundary layers. If you're using Comsol v4.1, boundary layers will automatically be applied to ensure a reliable solution. Good luck and have fun!
Mohamed Aref
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Posted: 1 decade ago 11 dic 2010, 15:00 GMT-5

Hi Mohamed,

A good way to get started, as Ivar says, is to open the Model Library. Click on File, then "Open Model Library". Go to the CFD or Fluid Flow folder, and view a few models. For each model, there's an option "Open PDF", which will open a document describing the model.

If you want to know more, read the User's guide. Go to C:/Comsol41/doc/pdf/CFD and open the PDF.

Start simple.

It's good to keep your flow in the laminar region. Read on Wikipedia what the difference is between laminar and turbulent flow - keep the Reynold's number below ~1500.

Start in 2 dimensions; it's easier and will not put very large strains on your memory. Start by building a rectangle of 0.02m wide and 0.1 m long. Choose air as material. Make the left boundary an "inlet" condition at 0.1 m/s. Set the right boundary as "Outlet", pressure = 0 Pa. Set up your mesh fine and if possible, use boundary layers. If you're using Comsol v4.1, boundary layers will automatically be applied to ensure a reliable solution.

Good luck and have fun!


Thank you very much
[QUOTE] Hi Mohamed, A good way to get started, as Ivar says, is to open the Model Library. Click on File, then "Open Model Library". Go to the CFD or Fluid Flow folder, and view a few models. For each model, there's an option "Open PDF", which will open a document describing the model. If you want to know more, read the User's guide. Go to C:/Comsol41/doc/pdf/CFD and open the PDF. Start simple. It's good to keep your flow in the laminar region. Read on Wikipedia what the difference is between laminar and turbulent flow - keep the Reynold's number below ~1500. Start in 2 dimensions; it's easier and will not put very large strains on your memory. Start by building a rectangle of 0.02m wide and 0.1 m long. Choose air as material. Make the left boundary an "inlet" condition at 0.1 m/s. Set the right boundary as "Outlet", pressure = 0 Pa. Set up your mesh fine and if possible, use boundary layers. If you're using Comsol v4.1, boundary layers will automatically be applied to ensure a reliable solution. Good luck and have fun! [/QUOTE] Thank you very much

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