Hi Ezat I performed several turbulent flow simulations over airfoils by using boundary layer mesh in Nektar++. Please see my recent published papers below for more information. If you would like to check the geometry files, I can send them for you. https://www.sciencedirect.com/science/article/pii/S0360544221005107 https://www.sciencedirect.com/science/article/pii/S0889974621001079 Best regards Mahdi ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ezat Shokrani <shokrani.ez@gmail.com> Sent: Saturday, June 12, 2021 6:38:34 PM To: nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Boundary layer mesh CAUTION: This email originated from outside of the University. Do not click links or open attachments unless you recognise the sender and know the content is safe. This email from shokrani.ez@gmail.com 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://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fspam.ic.ac.uk%2FSpamConsole%2FSenders.aspx&data=04%7C01%7Cmahdi.nakhchi%40northumbria.ac.uk%7Cfc341f5dddf54cba47d808d92dc91195%7Ce757cfdd1f354457af8f7c9c6b1437e3%7C0%7C0%7C637591164328209554%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=nOELYPy0zj7ZTPZVsbEtaXAcsqmbTy4y1YkzlVjxGdc%3D&reserved=0> to disable email stamping for this address. Dear Nektar++ developers, I am working on numerical simulation of blood flow in arteries. The flow regime of my case study is laminar. In addition to obtaining velocity and pressure field, the evaluation of shear rate and WSS for this case is also important for me. Therefore, in addition to using tetrahedral elements as core mesh, I am going to employ prism layers for resolving the boundary layer next to the wall. I have seen, in the literature, that there are two approaches for producing the boundary layer mesh that most groups use them. Firstly, some groups consider a constant total thickness for boundary layer mesh. This means that during the mesh study process, they do not change the overall thickness but they try to increase the number of layers. Secondly, other groups consider a constant number of layers for the boundary layer mesh (e.g. three layers for the coarse mesh) during the mesh study and when they refine the mesh in each step, the element size of each layer decreases. As a result, the total thickness of boundary layer mesh decreases too. Meanwhile, I have encountered some questions related to these approaches for producing boundary layer mesh. I have seen in articles related to the blood flow simulation which is done using Nektar++, p-refinement method has been used for mesh study process which I think this mimics the first approach. My question is that how I can calculate the total thickness of the boundary layer mesh (both steady and pulsatile flow conditions) through the mesh study. Related to the second approach, I have seen different research teams have various opinions for constructing the boundary layer mesh even for the cases with similar geometry and flow conditions. For example, different groups produce boundary layer mesh with a range of 3 to 20 layers. In addition, some consider a constant thickness for “each” layer (with no growth factor). However, others try to use a growth factor to vary the thickness of each layer. Even, different groups use a variety of core element size to boundary layer size ratio to construct the mesh. I know that this depends on the case study but they did not mention any reason for their choices. I would like to know whether or not there is a rule of thumb for this process or if there is a good guess for producing the boundary layer mesh with respect to this approach. I would be wondering if you could guide me on these issues. Best regards, Ezat Shokrani, This message is intended solely for the addressee and may contain confidential and/or legally privileged information. Any use, disclosure or reproduction without the sender’s explicit consent is unauthorised and may be unlawful. If you have received this message in error, please notify Northumbria University immediately and permanently delete it. Any views or opinions expressed in this message are solely those of the author and do not necessarily represent those of the University. Northumbria University email is provided by Microsoft Office365 and is hosted within the EEA, although some information may be replicated globally for backup purposes. The University cannot guarantee that this message or any attachment is virus free or has not been intercepted and/or amended.