general question general question https://oss.deltares.nl/c/message_boards/find_thread?p_l_id=298173&threadId=1885474 2020-01-17T13:51:05Z 2020-01-17T13:51:05Z RE: general question Frans Roelofsen https://oss.deltares.nl/c/message_boards/find_message?p_l_id=298173&messageId=1887026 2018-07-09T10:55:48Z 2018-07-09T10:55:48Z <p>Hi Franzi, </p> <p>1. iMOD models are calculated using the standard MODFLOW concepts/sourcecode. This means that also in iMOD, the nodes are in the middle of a cell</p> <p>2. Perhaps the explanation in the manual in chapter 12.4 (KDW Transmissivity) and especially figure 12.3 can help you on how MODFLOW handles transmissivity.<br /> If I understand your question correctly: a layer boundary cannot pass through a cell. There are 2 situations: 1) or the TOP/BOT is given in the Run file as the z interface between layers or 2) no TOB/BOT is given (use KDW for transmissivity) and than a layer/cell characteristic is binary; active or in-active.<br /> In case your question is about the iMODFLOW run and the boundary conditions; you need to use the same top/bot boundary definition as in the iMODFLOW run.</p> <p> </p> <p>Kind regards, Frans</p> Frans Roelofsen 2018-07-09T10:55:48Z general question Franziska Gebhard https://oss.deltares.nl/c/message_boards/find_message?p_l_id=298173&messageId=1885473 2018-07-06T21:37:01Z 2018-07-06T21:37:01Z <p>Hello,</p> <p> <br /> two general question:</p> <p> <br /> IMod works with the finite difference method. The area is divided into cells. In each cell there is a node where the calculations take place.<br /> 1.) WHERE are the nodes in iMOD? In the middle of the cell or at the interfaces of the grid lines?</p> <p>2.) And how does iMOD handle the calculations when a layer boundary passes exactly through a cell? For example, one half of the cell has the transmissivity of 34 m/d and the other half has a transmissivity of 10 m/d.</p> <p>I would appreciate an answer.</p> <p>Best regards</p> <p>Franzi</p> Franziska Gebhard 2018-07-06T21:37:01Z