Quasi 1D nozzle flow - John Anderson

pritam.gole · October 23, 2019, 05:36

Hi, I am trying to code the Quasi 1D nozzle problem as in John D Anderson's CFD book. I was having trouble understanding the non dimensionalising the distance. It is given as x' = x/L where x is the distance along the nozzle and L is the length of the nozzle.

By definition, that would mean that x' can only vary from 0 to 1. However, in the book everytime he mentions x' or x/L, it varies from 0 to 3. Can anyone help me in understanding how the range of x' is from 0 to 3 and let me know if I have missed something?

Thanks in advance.

fluid23 · November 7, 2019, 11:07

Question about Mac-Cormack method in Anderson?

pritam.gole · November 7, 2019, 13:27

Yes, it's from Anderson book.

fluid23 · November 7, 2019, 13:34

no... that's a link to a thread titled 'Question about Mac-Cormack method in Anderson?' where your question is addressed.

pritam.gole · November 7, 2019, 16:00

I checked the link but it seems like it's still a guessed answer.

fluid23 · November 7, 2019, 16:18

non-dimensional values can have any value. x/L does not have to be less than or equal to 1. don't get hung up on figure 1, it doesn't translate to the later examples. refer to the sketch he shows for the example.

short of calling up the National Air and Space Museum and asking the man himself, this is best answer you are likely to get. sorry if it doesn't meet your rigorous standards.

I think if you would carefully read and work the problem your concerns would be relaxed.

October 23, 2019, 05:36	Quasi 1D nozzle flow - John Anderson	#1
pritam.gole New Member Pritam Gole Join Date: Aug 2017 Posts: 8 Rep Power: 9	Hi, I am trying to code the Quasi 1D nozzle problem as in John D Anderson's CFD book. I was having trouble understanding the non dimensionalising the distance. It is given as x' = x/L where x is the distance along the nozzle and L is the length of the nozzle. By definition, that would mean that x' can only vary from 0 to 1. However, in the book everytime he mentions x' or x/L, it varies from 0 to 3. Can anyone help me in understanding how the range of x' is from 0 to 3 and let me know if I have missed something? Thanks in advance.

November 7, 2019, 13:27	Quasi 1D nozzle	#3
pritam.gole New Member Pritam Gole Join Date: Aug 2017 Posts: 8 Rep Power: 9	Yes, it's from Anderson book.

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November 7, 2019, 11:07		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Question about Mac-Cormack method in Anderson?

November 7, 2019, 13:34		#4
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	no... that's a link to a thread titled 'Question about Mac-Cormack method in Anderson?' where your question is addressed.

November 7, 2019, 16:00		#5
pritam.gole New Member Pritam Gole Join Date: Aug 2017 Posts: 8 Rep Power: 9	I checked the link but it seems like it's still a guessed answer.

November 7, 2019, 16:18		#6
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	non-dimensional values can have any value. x/L does not have to be less than or equal to 1. don't get hung up on figure 1, it doesn't translate to the later examples. refer to the sketch he shows for the example. short of calling up the National Air and Space Museum and asking the man himself, this is best answer you are likely to get. sorry if it doesn't meet your rigorous standards. I think if you would carefully read and work the problem your concerns would be relaxed.