Tutorial ANSYS CFX Part - 2/2 | Analysis of propeller, calculation thrust and power
ฝัง
- เผยแพร่เมื่อ 3 พ.ค. 2017
- In this tutorial I will show you how to make steady-state CFD analysis of propeller and calculation thrust (Force) and power.
1.We will create a water volume which to imitate calculation area
2.In module ANSYS Meshing we will set up parameters a grid
3.Will learn how to set boundary condition in ANSYS CFX-pre
4.We will post process the calculation results, and find out value thrust and power. - วิทยาศาสตร์และเทคโนโลยี
![[UNCUT] ที่นี่ที่แรก ปู - หาญส์ พูดถึงมหากาพย์หนี้สิ้น I คนดังนั่งเคลียร์ I 10 ก.ค.67](http://i.ytimg.com/vi/KDNA9DZ0p4U/mqdefault.jpg)
You can support the channel by subscribe -like - share the video and leave your opinion of the video in comment
Спасибо за видео, для себя многое понятно стало, но вот один нюанс. Я может туплю. Но где было значение тяги?
Thanks for the video, I am not pretty sure but I think your inlet and your outlet is wrong, they should be opposites
@@Engineer_Stories На 8:30 сила по оси Y. В данном случае она же и тяга.
@@TrueNRG Спасибо, позже заметил=)
Great job man. I could not find this stuff for 2 days and you just nailed it in one video. Thank you.
thank you sir
i badly waiting for such video.
Very helpful! Thank you very much, sir.
Thanks for learning 👍
Супер! то что надо :D
Я рад)
thank you
Hi, thanks for the great video! Could you possible make a savonius simulation inside a pipe? and derive power graphs and power coefficient graphs with RPM? That would be a huge help. There is a gap in existing videos!
thanks
Hi,
i am getting an error on solving
Default domain and domain 1 are isolated fluid regions and they dont have pressure levels set
How I can calculate the angular velocity and torque simultaneously ?
Hey, I didn't get it, where you mentioned the thrust and power calculation?
Can you justify why did you take the reference pressure for the rotating domain to be 0 atm? For the initialization, shouldn't it be the same as static pressure everywhere, which is 1 atm in your case? Also, why didn't you initialize the domain?
If we want to simulate the performance of the propeller at a certain depth, the reference pressure for the default domain would correspond to the hydrostatic pressure at that depth, right? In anticipation of a prompt response.
Great simulation, can you please do the same simulation using fluent ??
Maybe later.
Sir, how do i carry out same simulation at different rotational speeds using parameters. please make a tutorial
Is there any way to not lose almost all speed at boundary?
When you show streamline at 6.58 (th-cam.com/video/tBOFspg0sdU/w-d-xo.html) it looks like that the velocity drop with about 2 m/s wwhen it pass over to the still fluid. Is there any way I can prevent that?
How to plot residuals in cfx post?
thanks for the video but I got to say this method seams incorrect to me, the streamlines shape looks weird
it looks very confusing :( i couldn't understand why you used two times abstract option, can you please tell me about in a bit more detailed way? And why did you throwed mesh to the blades. I used to know that we only mesh the enclosure domain . İ have seen others cfx analysis and they didn't mesh the blades of any turbo machine.
Clearly your Yplus values were out of range. Does this MUST be fixed or can it be just ignored? In the case it must be fixed, what is a recommended strategy to do so?
Thanks for the video by the way!!
Hello, you can do size of prism layers less than in this video and to see how yplus change. For k-e model you must have yplus = 30 - 300, on blade and hub.
Hi Sir, at 8:01, the lowest total pressure is -7.185e+05, which is way lower than the atmospheric pressure (saturated vapor pressure) and cause severe cavitation. Any comments? thanks.
Hello, in this case pressure can has any value, because cavitation model is not activated
Hi ,
Can you explain why the inlet velocity was given as 5 m/s?
probably experimental data
How can I turn the propeller in the opposite direction
Добрый день. Спасибо вам за видео. Есть такой вопрос . Если задать что у нас турбина без обротов и на нее дует воздух. Как можно получить обороты ? Спасбо
Добрый день, да есть возможность определить обороты, использовать метод 6DoF, предварительно задав момент инерции ротора.
@@CFDIntech Момент инерции задается для начального старта раскручивания ?
@@user-dc2sx2gx5k нет, момент инерции это характеритика которую можно определить в CAD программе, зависит от формы и материала ротора, и не зависит от скорости вращения
hi, please what software was used in modeling the propeller?
I created a 3d model in a CAD Solidworks, and after, i used CAE ANSYS Workbench where simulation was completed.
CFD Intech how were you able to include parameters such as chord length, pitch ratio, and radii while modelling the propeller
Hi, can you do this simulation in Ansys Workbench (Fluid Flow Fluent) ?
Maybe later.
@@CFDIntech have u tried yet?
How did you get 5 m/s? Isn´t an output fron the applied rpm?
I think its fluid inlet velocity
thank you for the video sir.. So, what happens when Y+ value is greater than 300 ? Is it a problem for the design ?
Hello, you will get inaccurate results on walls for shear stress values, it means some troubles with calculation moment on a shaft
@@CFDIntech thanks for the answer sir.. I have another question.. how can I do the modal analysis of a ship propeller in water environment? I'm having difficulties on sharing the data from CFD results to modal analysis interface in ansys.
how to achieve a convergent simulation of hydraulic turbine like yours
Correctly boundary conditions. If you don't get a convergent you can to use transient simulation.
its a steady simulation
yes
in a six core core i7 (3930k) it converge but in a less powerful CPU (2600K)
its wont converge
Hi my friend, can you explain the negative value of force and torque on the impeller? Is there something wrong for that?
Dear ngoc tranbao!
Everything is correct, negative value of force and torque because in global system coordinates impeller was installed so that force was directed along -Y axis, but if we will rotate of impeller on 180 degrees relatively axis X, we will have positive value force. Torque depends of where we directed rotational speed relatively axis.
thanks for the video but i have to say Ansys is by far the worst and least ergonomic software i'v ever used.
its so messy and full of absurd things.
What software is better for you?
Мог бы и рассказать, не попугаи, хочется и понять что-то.
Прошу прощение, это старое видео, их я делал еще без пояснений, может быть есть смысл переделать их с объяснениями
@@CFDIntech смотрел это видео для расчёта имеллера и спрямляющего аппарата, построенного во фрикад. Задача несколько отличается от рассмотренной по-этому есть сложности при переносе на мой случай. Думаю при наличии пояснения будет легче всё это понять. Пользуюсь Ansys Help но это занимает время.
@@Andrenalin77 если это не коммерческая задача, или например вы можете поменять немного условия чтобы она стала открытой, я могу взять ее и по ней сделать видеоролик, это все бесплатно, мне это для развития канала будет полезно, можете написать мне на почту с описанием задачи если такой подход заинтересовал: cfd.intech@gmail.com