At this page you can post questions or start discussions on general topics related to Delft3D Flexible Mesh.

Please select a proper category below (if possible), to post your message or reply to an existing post. Please add tags to your posts to simplify searching.







Message Boards

Boundary Conditions - Curved Polyline

Paul Evans, modified 3 Years ago.

Boundary Conditions - Curved Polyline

Youngling Posts: 3 Join Date: 1/7/16 Recent Posts
Hi there,

I am trying to apply a water level time series to a curved boundary. Does anyone know if Delta Shell will linearly interpolate along the boundary if two points are specified at either end of the curved polyline, while retaining the geometry of it, i.e. a curvey line rather than a straight line will be assumed? We have added numerous points (and accompanying water level time series data) along the boundary, however, the resulting flow features look strange at these points.

Kind regards,

Michal Kleczek, modified 3 Years ago.

RE: Boundary Conditions - Curved Polyline (Answer)

Padawan Posts: 53 Join Date: 10/23/14 Recent Posts
Dear Paul,

I am sorry we have kept you waiting.
Firstly, indeed if we have a polyline that contains only 2 points with e.g. a water level value specified, let's assume A in the beginning and B in the end, then values between A and B will be linearly interpolated (analogically in case more points are defined). Secondly, the geometry of polyline does not influence the interpolation on the polygon. Unfortunately, you did not include network therefore it is hard for me to say if your boundary specification is correct in relation to your network.
Finally, it is important to the DflowDM how far is the polyline placed from a network boundary. In short, the polyline cannot be too far from cells that you intend to open with a certain boundary condition defined on that polyline, otherwise your boundary is not going to be applied to all intended cells. For more technical definition on that matter I recommend to look into the Technical User Manual for DflowFM section 6.4.

Could you please let us know if 'moving' your polygon closer to the network solved your 'strange' features?

Kind regards,
Michal Kleczek