When constructing a cfd numerical model, one should absolutely calirify assumptions/hypotheses and model limitations. Here at 7:24 the side faces are set to walls... Which greatly slows down airflow on both sides of the car plus, the the drag force is an integral physical quantity so the left and right sides of the car have to be included in the integral with air flowing over both sides for the boundary layer to build up, for a correct drag force prediction, what is done here is fundamentally incomplete, and physically unjustified. Remember, for a PDE solution to be representative of the physical phenomenon it has to be produced consistently, using the correct set of boundary conditions. Check your BCs.
Very useful tutorial. It helped me a lot. I have a doubt regarding lift coefficient. With the same procedure I solve lift coefficient. But for me it's getting above 3 for lift coefficient and above 4 k lift force. Is that right...please let me know asap. 🙏
hello, thank you for your knowledge, sir, I want to ask why when I do the setup, I get a warning: minimum orthogonal quality below 0.01 . what is the cause and what is the solution sir ,,, thank you
During initial iteration the solution does not reach to the fully developed flow and thus all variables are fluctuating in nature. Once the flow is established/developed, the fluctuation is stopped. Regards.
Useful tutorial,
Based on this problem, i have published research paper.
Perfectly delivered video.
Thank you👍
Can you send your research paper so that it can be helpful to me to work on this problem
@@EngineeringNature what about operating pressure? Did you put it to zero on outlet?
When constructing a cfd numerical model, one should absolutely calirify assumptions/hypotheses and model limitations. Here at 7:24 the side faces are set to walls... Which greatly slows down airflow on both sides of the car plus, the the drag force is an integral physical quantity so the left and right sides of the car have to be included in the integral with air flowing over both sides for the boundary layer to build up, for a correct drag force prediction, what is done here is fundamentally incomplete, and physically unjustified. Remember, for a PDE solution to be representative of the physical phenomenon it has to be produced consistently, using the correct set of boundary conditions. Check your BCs.
I accept your correction. Regards.
Thank you so much for the CFD videos. This helped me so much❤
You are welcome. We appreciate your feedback. If possible share this channel and videos to needy people, So they can learn easily.
Thank you very much for the CFD videos
Thanks🙏
Nice tutorial
thanks
Informative video for simulation
You can explore more tutorial on Engineering Nature
sir how to get area in reference value? is it car area ?
Yes, It's car area.
Very useful tutorial. It helped me a lot. I have a doubt regarding lift coefficient. With the same procedure I solve lift coefficient. But for me it's getting above 3 for lift coefficient and above 4 k lift force. Is that right...please let me know asap. 🙏
You should verify the dimension unit (mm/meter). Also check the reference value input. Let me know still not get proper value.
Very useful video but I am getting cd between 3.5-4.5 whereas it should be below 1.Can you guide me where could I be going wrong?
You should check reference value, update value for projected area.
hello, thank you for your knowledge, sir, I want to ask why when I do the setup, I get a warning: minimum orthogonal quality below 0.01 . what is the cause and what is the solution sir ,,, thank you
You should work on meshing
can you explain to me why the graph of Cd fluctuates but not at a specific number? i use model fastback
During initial iteration the solution does not reach to the fully developed flow and thus all variables are fluctuating in nature. Once the flow is established/developed, the fluctuation is stopped. Regards.
what will be the reference length in case of multiple car?
It's width of the car only
please help me