Homogenous Spanwise Averaging
******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Hi all, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin
Hi Dustin, You can use the “meanmode” module of FieldConvert which compute the data on the zero Fourier plane. You can use it on the flow fld files, or even on Reynolds stresses fld files. Hope this helps Cheers, Moshen From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ma, Ting-Hsuan <TIM48@pitt.edu> Date: Monday, 27 November 2023 at 20:10 To: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Homogenous Spanwise Averaging ⚠ External sender. Take care when opening links or attachments. Do not provide your login details. This email from TIM48@pitt.edu originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi all, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin
Moshen, Thank you for the helpful response! "meanmodes" performed exactly what I needed. I'm curious if there's a method to perform the spanwise average dynamically during computation time, meaning that the spanwise average is calculated per iteration, and this 2D plane is then averaged over time. Thank You, Dustin ________________________________ From: Mohsen Lahooti <Mohsen.Lahooti@newcastle.ac.uk> Sent: Monday, November 27, 2023 4:39 PM To: Ma, Ting-Hsuan <TIM48@pitt.edu>; nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: Re: Homogenous Spanwise Averaging Hi Dustin, You can use the “meanmode” module of FieldConvert which compute the data on the zero Fourier plane. You can use it on the flow fld files, or even on Reynolds stresses fld files. Hope this helps Cheers, Moshen From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ma, Ting-Hsuan <TIM48@pitt.edu> Date: Monday, 27 November 2023 at 20:10 To: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Homogenous Spanwise Averaging ⚠ External sender. Take care when opening links or attachments. Do not provide your login details. This email from TIM48@pitt.edu originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi all, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin
Hi Dustin We have a FieldConvert filter that you can include in your xml setting so it can compute some additional variables such as vorticity on the fly but it doesn't support all of FieldConvert Modules. So not sure if it works with meanmode or not. Even of it works with the menmode, it would be instantaneous field not the average one For averaging, you can use MovingAverage or AverageFields or both filters to have the average of the fields. Then convert this average fields with meanmode module. For several fld files you can use bash commands to facilitate the process. Cheers Mohsen Dr Mohsen Lahooti, PhD Lecturer in Fluid-Structure Interaction Mechanical Engineering Newcastle University School of Engineering Room 4.28, Stephenson Building Claremont road Newcastle upon Tyne NE1 7RU UK Email mohsen.lahooti@newcastle.ac.uk Webpage<https://www.ncl.ac.uk/engineering/staff/profile/mohsenlahooti.html> ________________________________ From: Ma, Ting-Hsuan <TIM48@pitt.edu> Sent: Monday, November 27, 2023 10:09:16 PM To: Mohsen Lahooti <Mohsen.Lahooti@newcastle.ac.uk>; nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: Re: Homogenous Spanwise Averaging Moshen, Thank you for the helpful response! "meanmodes" performed exactly what I needed. I'm curious if there's a method to perform the spanwise average dynamically during computation time, meaning that the spanwise average is calculated per iteration, and this 2D plane is then averaged over time. Thank You, Dustin ________________________________ From: Mohsen Lahooti <Mohsen.Lahooti@newcastle.ac.uk> Sent: Monday, November 27, 2023 4:39 PM To: Ma, Ting-Hsuan <TIM48@pitt.edu>; nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: Re: Homogenous Spanwise Averaging Hi Dustin, You can use the “meanmode” module of FieldConvert which compute the data on the zero Fourier plane. You can use it on the flow fld files, or even on Reynolds stresses fld files. Hope this helps Cheers, Moshen From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ma, Ting-Hsuan <TIM48@pitt.edu> Date: Monday, 27 November 2023 at 20:10 To: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Homogenous Spanwise Averaging ⚠ External sender. Take care when opening links or attachments. Do not provide your login details. This email from TIM48@pitt.edu originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi all, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin
Hi Dustin, A workaround for computing spanwise average per iteration is to use the dynamic filter "HistoryPoints" and set WaveSpace = "true". You will have to provide the coordinates of the "plane" you wish to sample from (note that z = 0 for spanwise averaged field). After which, you can post-process the .csv file using any platform you wish (python/matlab/jupyter/etc..). Cheers, Chi Hin ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ma, Ting-Hsuan <TIM48@pitt.edu> Sent: 27 November 2023 22:09 To: mohsen.lahooti@newcastle.ac.uk <mohsen.lahooti@newcastle.ac.uk>; nektar-users <nektar-users@imperial.ac.uk> Subject: Re: [Nektar-users] Homogenous Spanwise Averaging Moshen, Thank you for the helpful response! "meanmodes" performed exactly what I needed. I'm curious if there's a method to perform the spanwise average dynamically during computation time, meaning that the spanwise average is calculated per iteration, and this 2D plane is then averaged over time. Thank You, Dustin ________________________________ From: Mohsen Lahooti <Mohsen.Lahooti@newcastle.ac.uk> Sent: Monday, November 27, 2023 4:39 PM To: Ma, Ting-Hsuan <TIM48@pitt.edu>; nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: Re: Homogenous Spanwise Averaging Hi Dustin, You can use the “meanmode” module of FieldConvert which compute the data on the zero Fourier plane. You can use it on the flow fld files, or even on Reynolds stresses fld files. Hope this helps Cheers, Moshen From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ma, Ting-Hsuan <TIM48@pitt.edu> Date: Monday, 27 November 2023 at 20:10 To: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Homogenous Spanwise Averaging ⚠ External sender. Take care when opening links or attachments. Do not provide your login details. This email from TIM48@pitt.edu originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi all, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin
participants (3)
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Chan, Chi Hin
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Ma, Ting-Hsuan
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Mohsen Lahooti