I am facing a problem in ansys 20.in ansys 20,mesh details tab doesn't look same as this video,ins sizing, it showing options like adaptive sizing,nesh defeaturing etc.What shoul I do.By the way great content.
First, thanks you for your tutorials ninja they're clear and really helpfull. Unfortunately I still have a problem when it comes to the sizing. When you want to size the meshing, you just insert a sizing, select the geometrie then you choose the type "body of influence" but when I do in that way I do not have the option "Body of influence" to get it I need to first choose the type then the geometry. But when I do that way the case "Body of influence" stay in yellow and in the tree "meshing" and "body sizing" keep having a "?" instead of the green sign like you... Do you have any explanation or solution ? Btw I'm using a student free version pretty limitated, like only 512K cells for a meshing.
Hi friend; To use the body of influence option you must have your main body and a second body that will only serve to mesh using this option. Verify that both bodies have been created correctly. On the other hand I think that in this tutorial the mesh number exceeds 512k (from the student version). If the number of mesh elements exceeds that number I ask you to do the following; skip the step of the body of influence (use a single body) and develop the simulation. Soon I will make tutorials using Student version only. Best regards
Do you have any guides on setting mesh sizes for a certain? Considering models used etc. for fluent. And does meshing size affect that much the results like Cl and Cd in fluent ?? For example for a simple NACA0018 i get a Cl of 9 which is wrong.
Hi friend; You need to make a sensitivity analysis of the mesh to determine the optimal size, and yes, a very large mesh can give errors in the results. Best Regards
Also, it depends on your flow conditions. You also need to consider farfield effects for lifting bodies. There are publications which actually indicate there are farfield effects upto 100 times chord length. Obviously that is unreasonably for 2D simulation so we would have to live with some farfield effects or apply correction factors if possible.
Why did you split the lines of the airfoil ? And is having line bodies of the airfoil necessary for the simulation ? I'm only importing solidworks part into ansys which is only a planar surface. Thank you
hi this was a very good one. i am trying to model an airfoil having a moving flap at the trailing edge but i dont know how to start. can u help me with any tutorial?
dude.. the new version has a lot of changes.. i could not follow with you with the mesh steps.. the new version has different options and it tells me to put a circle radius in there... and i cant find the option for max mesh size... please tell me what to do and how to understand what im doing.. thanks
Hello sir you videos are very helpful. I wanted to know how to give boundary conditions for incompressible flow over an airfoil in (1)ground effect condition and (2) free stream condition(normal flight condition) with an inlet velocity of 30m/s ? I have selected naca 2412 airfoil for simulation.
Ivanrips i am trying to simulate the same wing but with a chord of 0.225m. however, at the trailing edge i have really skewed ellements and fluent will not let me to solve. if the chord is smaller do i need to pick different numbers in terms of edge sizing, body sizing, inflation thickness to get the same low skewness level as yours ?
Hi Ninja, can I use a hexagonal mesh instead of a trigonal mesh? I inserted the methond function and treid to change it, but it doesn't work for me. Regards
some edge or face size controls have smaller values than default defeaturing tolerance. mesh entities generated with these size controls will not be defeatured. why this message is shown.
Hi friend, you can change these values. Remember that is more important to validate the results that mesh message. if the simulation converges you can skip the message or change the values. Regards
When I open the Meshing, inside the Model, the Geometry and Line Body appear with an interrogation instead of a check. Do you know why??? In addition, the Model Type is Beam, but it is underlined yellow.
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I am facing a problem in ansys 20.in ansys 20,mesh details tab doesn't look same as this video,ins sizing, it showing options like adaptive sizing,nesh defeaturing etc.What shoul I do.By the way great content.
Hey Ninja, is it a new geometry you made from 0.02 until 0.31? can you help me with the video?
First, thanks you for your tutorials ninja they're clear and really helpfull.
Unfortunately I still have a problem when it comes to the sizing. When you want to size the meshing, you just insert a sizing, select the geometrie then you choose the type "body of influence" but when I do in that way I do not have the option "Body of influence" to get it I need to first choose the type then the geometry. But when I do that way the case "Body of influence" stay in yellow and in the tree "meshing" and "body sizing" keep having a "?" instead of the green sign like you... Do you have any explanation or solution ?
Btw I'm using a student free version pretty limitated, like only 512K cells for a meshing.
Hi friend;
To use the body of influence option you must have your main body and a second body that will only serve to mesh using this option. Verify that both bodies have been created correctly. On the other hand I think that in this tutorial the mesh number exceeds 512k (from the student version). If the number of mesh elements exceeds that number I ask you to do the following; skip the step of the body of influence (use a single body) and develop the simulation.
Soon I will make tutorials using Student version only.
Best regards
Helped alot👏👏👏👏
Can you explain similar one for a flow past a cylinder where the mesh is structured near the cylinder wake as well as top , bottom and upstream?
Do you have any guides on setting mesh sizes for a certain? Considering models used etc. for fluent. And does meshing size affect that much the results like Cl and Cd in fluent ?? For example for a simple NACA0018 i get a Cl of 9 which is wrong.
Hi friend;
You need to make a sensitivity analysis of the mesh to determine the optimal size, and yes, a very large mesh can give errors in the results.
Best Regards
Also, it depends on your flow conditions. You also need to consider farfield effects for lifting bodies. There are publications which actually indicate there are farfield effects upto 100 times chord length. Obviously that is unreasonably for 2D simulation so we would have to live with some farfield effects or apply correction factors if possible.
Why did you split the lines of the airfoil ? And is having line bodies of the airfoil necessary for the simulation ? I'm only importing solidworks part into ansys which is only a planar surface. Thank you
Hi friend,
I use split for create two regions extrados and intrados, however you can use one only. Regards
hi this was a very good one. i am trying to model an airfoil having a moving flap at the trailing edge but i dont know how to start. can u help me with any tutorial?
Hi shahriar omee I will try later, Regards
thanks for your reply..any tutorial will help me for now
This was so damn good ~ Please make more ! Can you make one for a 3D Airfoil NACA0012 ?
Thanks my friend; I will developed very soon Airfoil 3D NACA 0012.
Subscribe to my channel
dude.. the new version has a lot of changes..
i could not follow with you with the mesh steps.. the new version has different options and it tells me to put a circle radius in there... and i cant find the option for max mesh size... please tell me what to do and how to understand what im doing..
thanks
Hi friend, we will make New tutorials with ansys 2020 r1 soon.
Regards
@@ansys_cfd thanks.. waiting
Hello sir you videos are very helpful. I wanted to know how to give boundary conditions for incompressible flow over an airfoil in (1)ground effect condition and (2) free stream condition(normal flight condition) with an inlet velocity of 30m/s ? I have selected naca 2412 airfoil for simulation.
Hi friend, Thanks
For ground effect, you need to create a wall under of airfoil, for stream condition change the wall for an opening.
Regards
@@ansys_cfd Thank you very much sir for helping . I got the results.
You're welcome
Best Reagrds
Can this method work with an epplwe 423 aerofoil which is a reallyundercambered airfoil and also if I have an aerofoil with dimple will it work
Hi friend, I think that yes, the important is the turbulence model (separation of the boundary layer) and calculate the yplus. Regards
what skewness do you have at the trailing edge with this method ?
At the edge of the airfoil, the "skewness" varies from 0 to 0.55.
Regards
Ivanrips i am trying to simulate the same wing but with a chord of 0.225m. however, at the trailing edge i have really skewed ellements and fluent will not let me to solve. if the chord is smaller do i need to pick different numbers in terms of edge sizing, body sizing, inflation thickness to get the same low skewness level as yours ?
Cris Cris you need to decrease size of the mesh, you must try. Regards
Hi Ninja, can I use a hexagonal mesh instead of a trigonal mesh? I inserted the methond function and treid to change it, but it doesn't work for me.
Regards
Hi friend;
Here a tutorial about structured mesh: ruclips.net/video/FPWQu1oL7V8/видео.html
Regards
Hello my friend
did someone know what is floating point error? some times I got it on the fluent setup
thanks
some edge or face size controls have smaller values than default defeaturing tolerance. mesh entities generated with these size controls will not be defeatured. why this message is shown.
Hi friend, you can change these values. Remember that is more important to validate the results that mesh message. if the simulation converges you can skip the message or change the values. Regards
When I open the Meshing, inside the Model, the Geometry and Line Body appear with an interrogation instead of a check. Do you know why??? In addition, the Model Type is Beam, but it is underlined yellow.
Hi, It is because there is an error, you need to review again your geometry. All parts of your geometry should be checked. Regards
Have you been able to solve it? I have the same problem.
Where is the second video for this series ?
Hi friend;
Here videos about NACA airfoil: cfd.ninja/ansys-fluent/ansys-fluent-naca-airfoil-4412/
Regards
Can u send any other aerofoil coordinate points please its urgent
Hi friend, here another tutorial with another airfoil.
cfd.ninja/naca-airfoil-0012-with-angle-of-attack/
Regards
how much time it takes to generate final mesh? getting bored
Hi friend, That depend of your computer. Maybe this tutorial can be help:
ruclips.net/video/VDc_KGFKcrU/видео.html
Regards
if i cant select the boundary whats wrong?
Hi friend.
Do you get a message?
Regards
@@ansys_cfd No, my problem is that i have my airfoil in 64 edges and i want to join them in one continuously line. How can i do that?
Hi friend, you try to use merge tool.
I will try to make a tutorial about that next week.
Best Regardd